Emerson Anderson Greenwood 9300, Anderson Greenwood 9390P, Anderson Greenwood 9340C, Anderson Greenwood 9309V, Anderson Greenwood 9304V Installation And Maintenance Instructions Manual

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

Before installation these instructions must be fully read and understood

TABLE OF CONTENTS

1 Introduction .................................................. 2

2 Main valve .................................................... 3

3 Pilot maintenance ...................................... 14

4 Functional testing of complete

assemblyofmain valve and pilot .............. 27

5 Storage and handling ................................ 29

6 Trouble shooting ........................................ 30

7 Main valve spare parts and repair kits ..... 30

8 Pilot spare parts and repair kits ............... 31

9 Accessories, options, and

accessoryrepairkit ................................... 32

10 Lubricants and sealants for Series 9300.. 32

Installation and Maintenance Instructions
for Anderson Greenwood Series 9300 Pilot
Operated Safety Relief Valves (POSRV).
The intent of these instructions is to acquaint
the user with the storage, installation and
operation of this product. Please read these
instructions carefully before installation.

SAFETY PRECAUTIONS

When the safety valve is under pressure
neverplace any part of your body near
the outlet/exhaust of the valve.
The valve outlet and any separate drains should
be piped or vented to a safe location.
Always wear proper safety gear to protect hands,
head, eyes, ears, etc. anytime you are near
pressurized valves.
Never attempt to remove the safety valve from
asystem that is pressurized.
Never make adjustments to or perform
maintenance on the safety valve while in service
unless the valve is isolated from the system
pressure. If not properly isolated from the system
pressure, the safety valve may inadvertently open
resulting in serious injury.
Remove the safety valve prior to performing any
pressure testing of the system.
The safety of lives and property often depends on
the proper operation of the safety valve. The valve
must be maintained according to appropriate
instructions and must be periodically tested and
reconditioned to ensure correct function.

WARNING

The protection and safety of equipment, property
and personnel depends on the proper operation
of the safety valves described in this manual.
AllEmerson safety valves should be kept in proper
working condition in accordance with the
manufacturer’s written instructions. Periodic
testing and maintenance by the user of this
equipment is essential for reliable and safe valve
operation.
All installation, maintenance, adjustment,
repair and testing performed on safety valves
should be done by qualified technicians having
the necessary skills and training adequate to
perform such work. All applicable Codes and
Standards, governing regulations and authorities
should be adhered to when performing safety
valve repair. No repair, assembly, adjustment or
testing performed by other than Emerson or its
authorized assemblers and representatives shall
be covered by the warranty extended by Emerson
to its customers. The user should use only original,
factory supplied OEM parts in any maintenance or
repair activity involving this product.
This Maintenance Manual is provided as a general
guide for the repair and maintenance of the safety
valves described herein. It is not possible to
describe all configurations or variations with such
equipment. The user is advised to contact Emerson
or its authorized assemblers and representatives
for assistance in situations that are not adequately
covered or described in this manual.
Before removing a safety valve for maintenance,
ensure that the system pressure has been fully
depressurized. If an isolation block valve is used
ensure that any trapped fluid between the block
valve and the safety valve is safely vented.
Before disassembling the safety valve ensure that the
valve has been decontaminated from any harmful
gasses or fluids and that it is at a safe temperature
range for handling. Fluids can be trapped in
thedome space of pilot operated safety valves.
installation, the Installation and Operational Safety
Instructions should be fully read and understood.
These Instructions may
be requested from the factory or are available at

www.valves.emerson.com.

Before

STORAGE AND HANDLING

Pressure/vacuum relief valve performance may
be adversely affected if the valve is stored for
an extended period without proper protection.
Rough handling and dirt may damage, deform,
or cause misalignment of valve parts and
may alter the pressure setting and adversely
affect valve performance and seat tightness.
It is recommended that the valve be stored in
theoriginal shipping container in a warehouse
or at a minimum on a dry surface with a
protective covering until installation. Inlet and
outlet protectors should remain in place until
the valve is ready to be installed in the system.

Emerson.com/FinalControl

© 2017 Emerson. All rights reserved.

Engineering Doc. #05.9040.275 Rev.D

VCIOM-06024-US 15/01

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

1 INTRODUCTION

1.1 Description of valve

The Series 9300 employs the highly successful
pressurized PTFE film seat, as well as
protected FEP diaphragms. The design allows
these valves to be used in the pilot operated
pressure relief mode and simultaneously
provide vacuum relief, either via weight loads
of the internals, or with a specific pilot control
of the vacuum opening. The Series 9300
was designed with a special studded inlet
connection to reduce the inlet profile, and
coupled with larger orifice areas, these valves
provide flow capacities as much as 45% greater
than the Series 90 valves. The Series 9300 is
a full body valve to pipe away the discharge if
required.

1.1.1 Pilot operated safety relief valve with
non-flowing modulating pilot

• 9340P - Positive pressure relief valve

• 9340C - Positive and negative pressure relief

valve

• 9304V - Negative pressure relief valve

Pilot operated valves use a pilot to control
pressure over a large unbalanced member in
the main valve, such as a diaphragm piston.
Thelarge overbalance means a much larger
force on top of the seat compared to process
forces pushing up on the seat. At set pressure,
the pilot relieves the pressure quickly,
permitting the main valve seat to open rapidly.
All of the pilots have the same construction,
except for the location of the connections
to the main valve diaphragm actuators, or
theconnections for the pressure sense.
Foreither the 9340P or the 9340C, thepilot
controls only the positive pressure relief.
Thenegative pressure relief is controlled by
theweight of the parts that move in the main
valve when it opens. In the 9304V, the pilot
controls thenegative pressure relief.

1.1.2 Pilot operated safety relief valve with flowing
modulating or snap action pilot

• 9390P - Positive pressure relief valve

• 9390C - Positive and negative pressure relief

valve

• 9309V - Negative pressure relief valve

Weighted-loaded and spring operated valves
open as process forces overcome downward
forces, with little flexibility to overcome
problem applications. Anderson Greenwood
pilot operated valves can be adjusted to open
with a rapid ‘snap’ action or modulating action.
Most applications are well served by the snap
action mode, with full opening at set pressure
and full reseating after a short blowdown.
However, some systems might best be served
by a proportional opening, whereby the valve
opens just enough to satisfy small upsets
and maintain constant system pressure, yet
still have the capability to reach full capacity

within 10% overpressure. The 9390C and 9309V
pilots have the same construction except for
thelocation of the connections for the pressure
sense. For either the 9390P or 9390C, thepilot
controls only the positive pressure relief.
Inthe9309V, pressure relief is controlled
by theweight of the parts that move in the
main valve when it opens. The pilot controls
the negative pressure relief on the negative
pressure relief valve. The Anderson Greenwood
9390 Series can be set for a snap acting or
modulating mode with a simple adjustment of
the external blowdown screw. No part changes
are necessary to change the operating mode.

1.2 Service applicability

Refrigerated or cryogenic storage tanks
(accurate low-pressure protection), natural
gas transmission and distribution, blanketed
vessels in the petrochemical, food and
electronics industries, ammonia, air blowers in
the waste water treatment plants and marine
(LNG and LPG).

1.3 Code applicability

The Series 9300 are designed to meet
therequirements of ASME UV Code Stamp, NB
certified capacity 15 psig and above, and API 2000.

1.4 Conversion

Valve conversions are defined as any change
w

hich affects critical parts and/or valve
nameplate data, from that which was originally
supplied by the manufacturer such as a change
in set pressure. Conversions, when required
by the owner/user, shall only be performed
the manufacturer, their appointed/authorized
assembler or repair center in strict
accordance with written instructions provided
by themanufacturer. Communication with
themanufacturer is critical when making
any conversion to ensure the converted
valve(s) provides the same safe, reliable
performance as the original valve supplied by
the manufacturer.
For conversion information on the Series 9300
Pressure Relief Valves:

www.valves.emerson.com

by

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ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

1.5 SIZE/PRESSURE RANGES OF SERIES 9300 PRESSURE/VACUUM RELIEF VALVES

Materials AL, CS, SS

Main valve soft goods PTFE Diaphragm seat and seals
Pilot soft goods Elastomer or all PTFE Soft goods
Set pressure range 4” wc to 50 psig (9.9 mbarg to 3.45 barg)
Vacuum range -1.73” wc to -14.7 psig (-4.3 mbarg to -1.01 barg)
Process temperature -320°F to 200°F (-196°C to 93°C)
Size 2” to 12”
Blowdown - (fixed or variable)

1.6 Basic pilot series for the 9300 main valve

1.6.1 Series 91 Pilot

The Series 91 was designed for specific
applications where FEP diaphragms alone were
not rugged enough and premium sealing
required for super cryogenic fluids. Series9

was

1
design includes stainless steel (SS), and PTFE
diaphragms which provide extraordinary
performance for hard to hold cryogenic fluids.

1.6.2 Series 93 Pilot

The Series 93 is a pilot operated pressure
relief valve designed with elastomer seats
and seals, and construction materials in
aluminum (AL), carbon steel (CS), and stainless
steel(SS). These construction materials satisfy
the majority of gas piping and chemical tank
applications. The Series 93 pilot can be used
on any Series 9000 valve except a combination
9000 larger than 6”.

1.6.3 Series 93T Pilot

The Series 93T was an offshoot of the Series
93, designed specifically for cryogenic and
chemical applications where an elastomer seal
is not satisfactory.

1.6.4 Series 400B

The Series 400B is used with 8”, 10”, and
12” combination weight-loaded vacuum and
pressure valves where quick relieving of dual
chamber diaphragms is required to open
themain valve.

2 MAIN VALVE

2.1 General main valve maintenance

Since the Series 9300 valve can be either a
pressure only, vacuum only, or pressure/
vacuum relieving device, it is built in a modular
fashion. The standard single diaphragm unit
will function on pressure and vacuum, however,
opening under very low vacuum requires use of
the auxiliary diaphragm chamber. The valve can
also be repaired in a modular fashion. The seat
can be replaced without complete disassembly
of the diaphragm cases. Selective repair can be
performed as required.
Prior to disassembly of the main valve
or pilot, it is recommended to stamp or
mark the location of the pilot, and the
orientation of thediaphragm cases, studs,
and column supports to the main valve body.

Thispracticewill ensure proper alignment and
location of parts during reassembly.
To prevent mixing up parts it is recommended
to repair the main valve and pilot in stages.
Forthis reason, the diaphragm, nozzle, and seat
maintenance and/or replacement instructions
are separate from the pilot instructions.

2.2 Main valve single chamber diaphragm
disassembly (Refer to figure 1)

1. Remove the pilot (as a unit) and the tubing
from the diaphragm case. Set them aside.

Note: match mark orientation of tubing and

case assembly to the body. This will assist in
reassembly.

2. Unscrew the case bolts (700/710) and
remove the upper diaphragm case (210).

3. On valve sizes 2” through 4”, remove the
diaphragm assembly, lower case (280), shaft
(320) and seat plate assembly from the main
valve body (100).

4. On valve sizes 6” and larger, remove seat
plate assembly from shaft (320) prior to
removing diaphragm assembly, lower
case (280), and shaft (320). To remove, spin
diaphragm plate assembly counterclockwise
while holding seat plate assembly stationary
until shaft (320) is free of seat hub (420).
Theseat plate assembly should then rest on
nozzle (460).

5. On valve sizes 6” and larger, remove
diaphragm assembly and shaft (320) from
lower case (280). Then remove lower case
from the body (100).

6. On valve sizes 6” and larger, lift seat plate
assembly from the body (100).

CAUTION

When removing seat plate assembly, be careful
not to damage thenozzle (460).

7. Unscrew counterclockwise the seat plate
assembly from the main shaft (320). This is

9

normally a hand operation, however, a

/

16”

(14.3 mm) wrenching flat is provided on the
seat hub (420). The connecting thread will
run free, then tighten, and run free again as
it disengages from a locking helicoil (330)
in the vertical shaft (320). This will allow the
seat plate assembly, diaphragm assembly
and lower case (280) to be separated.

8. Holding the shaft (320) stationary, remove
the jam nut (520) from the diaphragm
assembly. Remove the diaphragms
(170,175, 950, 960), washers (580, 590, 600),
gaskets (620), plates (150, 160), and lower
case (280) (as a unit) from the shaft (320).

3

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

2.3 Main valve dual chamber diaphragm
disassembly (refer to figure 2)

1. Remove the pilot and tubing from
theauxiliary diaphragm case.

Note: match mark orientation of tubing and

case assembly with the body. This will assist
in reassembly.

2. Unscrew the upper auxiliary case bolts
(700) and nuts (730), and remove the upper
auxiliary diaphragm case (210B).

3. Install a 6” to 8” long braided wire through
the hole at the top of the lift rod (250) to retain
the lift rod (250). (See Figure 3, detail C)

4. Lift the auxiliary (160B, 170B, 290) and main
diaphragm (150, 160A, 170A) assemblies
to the full open position using the auxiliary
vacuum plate (160B). The open dome port
can be temporarily capped to hold the main
diaphragm assembly open.

5. Remove nuts (530 and 520B) and PTFE
O-ring (670). (See Figure 3, detail A).

6. The lift rod (250) is attached to the auxiliary
plate bushing (240) with threads. Unscrew
the lift rod (250) from the bushing (240) by
turning the rod (250) clockwise until it drops
down into the main valve shaft bore (320).

7. Remove the main diaphragm case bolts
(700, 710). Remove the studs (810) from
the body (100). Remove the lower auxiliary
diaphragm case (280B) and the upper main
diaphragm case (220) as a unit, which is
assembled to the diaphragm case adapter
(230). Allow the lift rod (250) to slip from
the center hole and lift the lower auxiliary
diaphragm case (280B), upper main
diaphragm case (220), and adapter (230)
upwards as one unit.

10. On valve sizes 6” and larger, remove
diaphragm assembly (150, 160A, 170A) and
shaft (320) from lower case (280A). Then
remove lower (280A) case from the body (100).

11. On valve sizes 6” and larger, lift seat plate
(910, 920) assembly from the body (100).

CAUTION

When removing seat plate assembly (910, 920),
becareful not to damage the nozzle (460).

12. Unscrew counterclockwise the seat
plate (910, 920) assembly from the main
shaft (320). This is normally a hand

9

operation, however, a

/

16” (14.3 mm)

wrenching flat is provided on the seat
hub (420). Theconnecting thread will
run free, thentighten, and run free again
as it disengages from a locking helicoil
(330) in the vertical shaft (320). This will
allow theseat plate assembly (910, 920),
diaphragm (150,160A,170A) assembly and
lower case (280A) to be separated.

13. Holding the shaft (320) stationary,
remove the jam nut (520A) from the
diaphragm (150, 160A, 170A) assembly.
Removethediaphragms (170A, 175A, 950,

960), washers (580, 590, 600), gaskets
(620A), plates (150A, 160A), and lower
case (280A) (as a unit) from the shaft (320).
(Seefigure 3, detail C).

With the main valve disassembled, you are now
ready to disassemble, inspect, and replace soft
goods starting with the seat plate (910, 920)
assembly.

CAUTION

Be careful not to bend the lift rod (250) during
case assembly removal.

8. On valve sizes 2” through 4”, remove
thediaphragm assembly (150, 160A, 170A),
lower case (280), shaft (320) and seat plate
assembly (910, 920) from the main valve
body (100).

9. On valve sizes 6” and larger, remove seat
plate assembly (910, 920) from shaft (320)
prior to removing diaphragm assembly
(150, 160A, 170A), lower case (280) and
shaft (320). To remove, spin diaphragm
plates (150, 160A, 170A) assembly
counterclockwise while holding seat plate
(910, 920) assembly stationary until shaft
(320) is free of seat hub (420). The seat plate
(910, 920) assembly should then rest on
nozzle (460).

4

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

MAIN VALVE PARTS

Item Description

100 Body
110 Screw - nozzle retainer
120 Screw - seat (used with Item 130 seat plate assembly option 1)
125 Clamp band - seat (used in place of item 120 and 130 seat plate assembly option 2)
130 Nut, lock (used with item 120 seat plate assembly option 1)
140 Retainer seat
150 Plate - main pressure
160 Plate - main vacuum
170 Diaphragm - main
175 Diaphragm reinforcement (used on 2” and 3” low pressure only)
210 Case, upper diaphragm
215 Cap spacer (6” only, not used on dual chamber diaphragm)
220 Case, upper main (used on dual chamber diaphragm only)
230 Adapter (used on dual chamber diaphragm only)
240 Bushing (used on dual chamber diaphragm only)
250 Rod (used on dual chamber diaphragm only)
260 Bushing - rod (used on dual chamber diaphragm only)
270 Washer (used on dual chamber diaphragm only)
280 Case, lower diaphragm
290 Plate - aux pressure (used on dual chamber diaphragm only)
300 Washers (used under 700/710 on aluminum cases only)
320 Shaft - assembly (includes item 330 as part of assy)
330 Helicoil
340 Sleeve guide
360 Bushing split (not used on 2” and 3” or high pressure)
420 Hub seat
430 Spacer seat
440 Bushing seat
450 Nut - seat jam
460 Nozzle (assembly)
500 Bushing guide
520 Nut - jam
530 Nut (used on dual chamber diaphragm only)
570 Secondary seat (high pressure only)
580 Washer
590 Washer
600 Gasket - clamp plate
610 Seat - film
620 Gasket - case
630 Nozzle gasket
640 Spacer (O-ring/-018)
660 Gasket - adapter (used on dual chamber diaphragm only)
670 Seal - adapter (used on dual chamber diaphragm only)
680 Retaining - ring (used on dual chamber diaphragm only)
690 Seal - rod (used on dual chamber diaphragm only)
700 Cap bolt - hex
710 Cap bolt - eye (not shown used on 4” and above)
730 Nuts (used on dual chamber diaphragm only)
810 Stud
820 Nut
840 Stud - 2nd chamber support (used on dual chamber diaphragm only)
850 Nuts (used on dual chamber diaphragm only)
890 Screen - lower case
900 Screen - upper case (used on dual chamber diaphragm only)
910 Plate - seat
920 Plate - seat protector
930 Nameplate (not shown)
940 Rivets (not shown)
950 Diaphragm slipper outer
960 Diaphragm slipper inner
970 Washer seat (used prior to 1990)

NOTE

Suffix A and B are used after Item #s to denote parts
for main and auxiliary chambers in the dual chamber
design.

5

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

170/175

700/710

620

950

960

Seat plate assembly
(lowandhighpressure aluminum)
(highpressurestainless steel)

100

810/820 110 460

500

See detail C

See detail D

Internal pressure pickup not included with
remote pressure sense

210

890

160

150

280

340

360

320

See detail E

Seat plate assembly
(lowpressure stainless steel)

See detail D

FIGURE 1
9390P Single chamber diaphragm assembly

See detail E

6

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

700

730

280B

290

250

170A/170B

700/710

See detail D

Seat plate assembly

See detail C

160B

See detail A

See detail B

Dome port

170B/175B

210B

730

620B

730

840

220

500A

890

620A

160A

150

280A

340

360

320

810/820

FIGURE 2
9390C Dual chamber diaphragm assembly
Remote pressure sense shown

100

See detail E

7

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

175B

590B

530

670

160

150

Single chamber diaphragm

600

580

320

600

520

590

520B

580

160B

170B

270

690

110

230

Detail “A” and “B” assembledDetail “D”

Retaining wire for assembly
and disassembly

680

900

500B

250*

220

500B

FIGURE 3

240

Detail “A”

Auxiliary diaphragm chamber assembly

230

Detail “B”

690

660

160A

170A

150A

580

590

320

Detail “C”

* Used only with dual chamber diaphragm model

520A

260*

175A

600

8

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

2.4 Main valve seat disassembly and

replacement (bolted) (refer to Figure 4, detail
D, and Figure 5, detail E)

1. To assist in seat plate disassembly, partially
thread the seat plate assembly into the
fixture which consists of a 6” long hexagon
bar with a ½” x 13 x 1” deep threaded hole in

5

one end, and a

/

16” x 18 x 1” deep threaded

hole in the other end.

5

Note: the

/

16

” hole is for valves sizes
2” through 6” and the ½” hole is for 8”
through12”.

2. With the seat plate assembly threaded into
the fixture, secure the fixture into a vise and
remove the seat screws (120) by holding
thelock nut (130) and turning the screws
(120) counterclockwise. Then remove
theseat plate (910).

9

3. Holding the

⁄

16” wrench flat (located at

the top end of the seat hub (420)) secure,
loosenthe seat plate jam nut (450) by
turning it clockwise. Then remove the seat
hub (420) from the fixture and disassemble
the remaining parts of the seat plate
assembly.

Note: secondary PTFE seat (570) used only

in high pressure stainless steel options.

4. Inspect seat plate (910) radius for damage.
Minor nicks and scratches may be removed
by polishing radius with 320 grit or finer
sand paper, maintaining seat shape.

WARNING

No lapping or machining of seat plate allowed.

5. Inspect threaded parts and sealing surfaces
and if damaged replace. Otherwise, clean all
metal parts with oil free solvent and dry with
lint free towel.

6. The new seat film (610) is supplied as a
square sheet of PTFE without holes for
thescrews. To install, secure the larger end

9

of the seat hub with the

/

16” wrenching flat

into a vise and install in this order: protector
plate (920), PTFE seat film (610), seat
bushing (430), spacer (640) (on outside of
seat plate (910), on 6” size seat plates), seat
plate (910) (radius side down) and jam nut
(450). Then tighten by turning the jam nut
(450) clockwise.

7. Remove the seat hub (420) from the vise and
install it into the fixture. To complete the
assembly, install the secondary seat (570)
(high pressure stainless steel only) and then
the seat retainer (140) (bevel side down)
onto the seat film (610). Then using a scribe
punch out a hole in the film starting with the
four threaded indicator holes (only threaded
holes in seat retainer (140)). Then install

the
4 long retainer screws (120) through those
holes and tighten in a criss cross pattern.

Note: lubricate retainer screws (120) with

Fluorolube to reduce the chances of galling.

8. Punch out the remaining seat screw holes
and install the screws (120) and nuts (130)
and tighten.

CAUTION

Be careful not to puncture or scratch the seat
(610) during this operation.

9. Trim off the excess film from the outside
diameter of the seat plate (910) to complete
the replacement process.

FIGURE 4, DETAIL D
Main valve seat plate hub assembly

9

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

2” Inlet size 3” thru 12” inlet size

Aluminum internals

2” Inlet size 3” thru 12” inlet size

Low pressure stainless steel internals

2” Inlet size 3” thru 12” Inlet size

High pressure stainless steel internals

FIGURE 5, DETAIL E
Main valve seat plate assembly (internal pressure sense shown)

10

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

2.5 Main valve seat disassembly and
replacement (banded) (Refer to Figure 4,
detail D and Figure 5, detail E)

1.

To assist in seat plate disassembly, partially
thread the seat plate assembly into the fixture
which consists of a 6” long hexagon bar with
a ½” x 13 x 1” deep threaded hole in one end,

5

/

and a

16” x 18 x 1” deep threaded hole in the

other end.

5

Note: the

/

16” hole is for valves sizes

2” through 6” and the ½” hole is for 8”
through12”.

2. With the seat plate assembly threaded into
the fixture and secured in a vise, remove

9

the band clamp (125). Then holding the

/

16

wrench flat on the seat hub (420) stationery
remove the seat plate jam nut (450).

3. Remove the seat hub (420) from the fixture
and disassemble the remaining parts from
the seat plate assembly.

4. Inspect seat plate (910) radius for damage.
Minor nicks and scratches may be removed
by polishing radius with 320 grit or finer
sand paper maintaining seat shape.

WARNING

No lapping or machining of seat plate allowed.

5. Inspect threaded parts and sealing surfaces
and if damaged replace. Otherwise, clean all
metal parts with oil free solvent and dry with
lint free towel.

6. The new seat film (610) is pre-molded.
Toinstall, secure the wrenching flat of
theseat hub (420) into a vise and install
the protector plate (920), PTFE seat film
(610) (radius side down), seat bushing (430),
spacer (640), seat plate (910) (radius side up),
and install the jam nut (450) HAND TIGHT.

CAUTION

Tightening the jam nut (450) prior to stretching
the film (610) will cause ripples in the film.
(SeeFigure 5, Detail E)

7. Remove the seat hub (420) from the vise
and install it into the fixture. Then install
the seat retainer (140) (beveled side down)
onto the seat film (610), and then install
theclamp band (125) and tighten.

8.

Using a heat gun, apply heat to the seat film
(610) in a circular motion approximately 2” to
3” above surface until all ripples and

creases
are gone. This usually takes less than 1minute.
Now tighten jam nut (450) wrench tight.

9. Trim excess film (610) from back side of seat
plate (910) to complete reassembly process.

2.6 Diaphragm replacement

2.6.1 Single chamber diaphragm replacement
(See Figure 3, detail D)

1. Secure the main valve shaft (320) wrenching
surface in a soft jaw vise. Caution should be
taken when securing aluminum shaft (320)
to prevent destroying the part.

2. Remove jam nut (520) by turning it
counterclockwise.

3. Note: mark plates as top (vacuum) and
bottom (pressure) prior to disassembly.
Remove the following parts in thisorder:
washer (580), vacuum plate (160),
washer (590), diaphragm (170), *slipper/
reinforcement diaphragm (950,960/175)
(seenotes for configuration variances),
pressure plate (150), and PTFE washer (600).

Note: on single chamber valves with high

pressure stainless steel internals, an outer
(950) and inner (960) diaphragm slipper is
used to protect the diaphragm (170) from
wear. The outer slipper (950) is between
the diaphragm (170) and lower case (280).
Theinner slipper (960) is between the
diaphragm (170) and the pressure plate(150).

Note: on 2” and 3” single and dual chamber

valves with low pressure aluminum or low
pressure stainless steel internals, use a
reinforcement diaphragm (175) between
the main diaphragm (170) and lower case
(280). The reinforcement diaphragm (175)
is recognized by a small offset hole at
thecenter of the diaphragm.

CAUTION

Installing the reinforcement diaphragm (175)
in the wrong location will cause damage to
thediaphragm assembly.

4. Inspect plates (150, 160) for cracks,
warpage. Clean all metal parts with oil free
solvent, and dry with lint free towel.

5.

Proceed with this step only on disassembly of
main valve dual diaphragms. Inspect lift rod
(250) straightness and ensure small diameter
tip is not damaged. Also raise the lift rod(250)
up and check the surface for damage.

6. Proceed with this step only on disassembly
of main valve dual diaphragms. Install 6” to
8” of braided stiff wire through the hole at
the top of the lift rod (250). This will aid in
reassembly of auxiliary diaphragm.

7. Install new PTFE washer (600), pressure
plate (150), *slipper/reinforcement
diaphragm (950,960/175) (radius side down)
(see notes for configuration variances),
diaphragm (170), flat washer (590), vacuum
plate (160), flat washer (580), and jam nut (520).

Note: on single chamber valves with high

pressure stainless steel internals, an outer
(950) and inner (960) diaphragm slipper is
used to protect the diaphragm (170) from
wear. The outer slipper (950) is between
thediaphragm (170) and lower case (280).
The inner slipper (960) is between the
diaphragm (170) and the pressure plate (150).

Note: on 2” and 3” single and dual chamber

valves with low pressure aluminum or low
pressure stainless steel internals, use a
reinforcement diaphragm (175) between
the main diaphragm (170) and lower case
(280). The reinforcement diaphragm (175)
is recognized by a small offset hole at
thecenter of the diaphragm.

CAUTION

Installing the reinforcement diaphragm (175)
in the wrong location will cause damage to
thediaphragm assembly.

8. Tighten jam nut (520), wrench tight.

11

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

2.6.2 Dual chamber diaphragm replacement
(SeeFigure 3, detail A, B, C)

1.

Secure auxiliary diaphragm bushing(240) into

CAUTION

When tightening jam nut be careful not to damage
diaphragm.

soft jaw vise, and remove nut(530) and jam
nut (520B) by turning it counterclockwise.

2. Remove washer (580), auxiliary plate (160B),
washer (590A), reinforcement diaphragm
(175), washer (270), and PTFE washer (600).

3. Inspect threads on bushing (240) and general
condition of metal washers (270, 580, 590B)
including sealing surface where PTFE
washers (600) seat. Clean metal parts with

Note: on 2” and 3” single and dual chamber

valves with low pressure aluminum or low
pressure stainless steel internals, use
areinforcement diaphragm (175B) between
the main diaphragm (170B) and lower
case (280B). The reinforcement diaphragm
(175B) is recognized by a small offset hole at
thecenter of the diaphragm. (See detail A)

oil free solvent, and dry with lint free towel.

4. Install PTFE washer (600), washer (smooth
side up) (270), auxiliary diaphragm (radius
side down) (170), washer (smooth sidedown)
(590B), auxiliary plate (bevel side down) (160B),
washer (580), jam nut (520B), and tighten by
turning the jam nut (520B) clockwise.

2.7 Main valve nozzle replacement

1. Remove nozzle retaining screws (110) and
gently tap nozzle (460) with soft face mallet.

2. Inspect nozzle seating surface for nicks or
scratches. If they cannot be removed with a
crocus cloth or finer sandpaper, the nozzle
(460) must be replaced.

1. The contact surfaces must be clean, free from grease, and dry.

2. Remove the protective strip on the adhesive tape.

3. Lightly press in place as shown below.

UPPER CASE(S) AND TOP OF BODY

3. If the upper and lower nozzle gaskets (630)
are to be replaced, install PTFE gasketing.
(See Figure 6, Section A-A, the nozzle part only)

4. Reattach nozzle (460) and retaining
screws(110).

Put tape just inside of bolt holes, overlapping ends at a bolt hole. Put tape on top case only.
Puttape on top surface of body. Do not put on lower case of mating pair.

Nozzle

A

Section A - A

A

Place tape toward outer edge of each gasket ledge. Put overlaps on opposite sides.

3

Use ⅛” tape on 3” and 4” nozzles.

/

16” tape on all cases and larger nozzles.

FIGURE 6
PTFE Tape gasket mounting instructions

12

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

2.8 Reassembly of main valve single chamber
diaphragm

1. Ensure nozzle (460) maintenance is
complete and nozzle (460) is reinstalled.

2. Secure seat hub (420) into soft jaw vise.

3. Install lower case (280) on top of seat plate.

4. Lower shaft (320) and diaphragm assembly
through center hole of case (280).

5. Holding shaft (320) stationary, screw the
seat plate assembly (910, 920) onto the main
valve shaft (320). The connecting thread
will run free, tighten, and free again as it
engages with the locking helicoil (330).

CAUTION

Do not tighten the seat hub against the shoulder
of the shaft.

6. Apply PTFE gasketing (620) to top of the
main valve body (100). (See Figure 6)

7. Lower seat plate (910, 920), shaft assembly,
(320) and lower diaphragm case (280) into
main valve body (100). Align bolt holes with
diaphragm (170), case (280), and body (100).

8. Install PTFE gasket (620) material to upper
case (280). (See Figure 6)

9. Reattach the upper diaphragm case (210)
and seat plate assembly (910, 920) to
thebody (100).

10. Align match marks of case (210) with body
(100), and install cap bolts (700, 710) and
tighten in a crisscross pattern.

11. Reattach the pilot and tubing.

2.9 Reassembly of main valve dual chamber

diaphragm

1. Ensure nozzle (460) maintenance is
complete and nozzle (460) is reinstalled.

2. Secure seat hub (420) into soft jaw vise.

3. Install lower case (280A) on top of seat
plate(910).

4. Lower shaft (320) and diaphragm assembly
through center hole of case (280A).

5. Holding shaft (320) stationary, screw the
seat plate assembly onto the main valve
shaft (320). The connecting thread will run
free, tighten, and free again as it engages
with the locking helicoil (330).

CAUTION

Do not tighten the seat hub against the shoulder
of the shaft.

6. Apply PTFE gasketing (620) to top of
themain valve body (100). (See Figure 6)

7. Lower seat plate (910, 920), shaft assembly
(320), and lower diaphragm case (280A) into
main valve body (100). Align bolt hole with
diaphragm (170A), case (280A), and body (100).

8. Replace the Seal Rod (690) in the upper end
of the adapter bore (230) lubricating it with
Dow Corning FS3451 or equivalent when the
new one is installed. (See Figure 3, Detail A)

9. Install PTFE gasket material to upper main
case (220) (See Figure 6) and lower auxiliary
case assembly spool (see Figure 6).

10. Lubricate threads and shaft of lift rod (250)
and lower spool assembly onto the main
valve (100) while lifting rod wire through
thecenter hole of the adapter (230).

11. Align match marks of case (220, 280A) with
body (100), and install cap bolts (700, 710)
and tighten in a crisscross pattern.

12. Lower auxiliary diaphragm assembly onto
lower auxiliary case (280B) lifting rod wire
through the center of diaphragm bushing
(240). Holding the wire, spin diaphragm
assembly 2 full turns clockwise.

13

. Now bend the wire in half and spin the liftrod

(250) counterclockwise approximately 20turns.
This is the starting position for setting the
lift of the auxiliary diaphragm (170B).

14. To set lift position, position the edge of a
ruler at the top edge of the auxiliary vacuum
plate (160B) and lift the rod (250) up. Normal

3

lift is ⅛” to

/

16”. To increase lift, spin rod

(250) clockwise. To decrease lift, turn rod
counterclockwise.

15. To lock setting insert PTFE seal rod O-ring
(690) onto rod (250) and install jam nut
(520B). To tighten, hold jam nut (520B) and
lift rod (250) stationery and turn rod jam nut
(530) clockwise until wrench tight.

Note: re-check Lift to ensure adjustment

did not change during tightening.

16. Uncap the dome port and close the auxiliary
and main diaphragm assemblies.

17.

Apply PTFE Gasket (620B) to upper auxiliary
diaphragm case. (See Figure 6) Replace the
upper auxiliary diaphragm case (620B). Install
case bolts (700) and nuts (730) and tighten.

18. Replace the pilot and tubing.

3 PILOT MAINTENANCE

3.1 Pilot disassembly for non-flowing

modulating pilots (Series 400B)
(RefertoFigures 7 and 8)

1. Remove bonnet cap (5), loosen adjustment
screw lock nut (7), back out adjusting screw
(6) to relieve spring (9) tension. Removebonnet
nuts (11), bonnet washers (10and 53), bonnet
assembly (4, 29, 51), bonnet gasket (12), spring
washer (8), and spring (9).

2. Push down on spool retaining nut (30)
with a Phillips screw driver engaging the
spool anti-rotation pin (21), and remove
nut (30) with a ½” open end wrench turning
counterclockwise.

3.

Remove spindle spring (31), case bolts (13and

48), nuts (17 and 49), washers (16and 50) and
upper case (3). Remove the bonnet studs (43).
Note: internals are now accessible for removal.

4. Remove -014 O-ring (32), plate sense gasket
(18), sense plate (33), sense diaphragm (34),
gasket (15), ring lantern (35), diaphragm

(19), feedback diaphragm (38), gasket (15),
feedback diaphragm plate (14) and gasket (15).

5. Remove spool (36) and spindle (24) assembly.

6. Remove the lower spindle, -013 O-ring
(23), outlet seat (22), -014 O-ring (32) from
the spindle (24). Now the spindle (24) may
be removed from the spool (36). Remove
thetop inlet seat O-ring from the spindle.

7. Remove the lower diaphragm case (2)
from the body by removing the 4 inner case
bolts(20).

8. Remove the inlet connector (27) and inlet
screen (41) by removing the 2 bolts (28) on
the side of the pilot body (1).

9. Clean all metal parts, and throw away all
gaskets, diaphragms, and seals.

Note: pay particular attention to all port

holes and polished areas.

13

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

FIGURE 7

Detail A

2

43

18

19

20

Auxiliary dome
connection ½ NPT

Exhaust ports (frontand back)
withventscreen item 29

54/10

5

53

8

11

12

3

21

22

42

32

23 24

Pressure

actuator

connection

1

6

7

32

29

Detail C

9

4

30

51

31

32

33

34

35

36

Detail B

25 26 27 283741

48

50
49

38

¾ NPT

Pilot inlet pressure

Inlet ½ NPT

Detail D

PARTS

Item Description Item Description Item Description

1 Body 20 Bolt 35 Ring - lantern
2 Case - diaphragm, lower 21 Pin - groove 36 Spool
3 Case - diaphragm, upper 22 Bushing - guide 37 Gasket - body
4 Bonnet assembly 23 O-ring (-013) 38 Slipper - feedback diaphragm
5 Cap - bonnet 24 Spindle 41 Screen - inlet
6 Screw - pressure adjustment 25 Ferrule - tubing 42 Plug - pipe
7 Nut - lock 26 Retainer - inlet connection 43 Stud - bonnet
8 Washer - spring 27 Connector - inlet 48 Case bolt
9 Spring 28 Bolt 49 Nut
10 Washer - plain 30 Nut - spool retainer 50 Washer
11 Nut 31 Spring - spindle 51 Plug
12 Gasket - bonnet 32 O-ring (-014) 52 Insert
18 O-ring (-022) 33 Plate - sense 53 O-ring
19 Diaphragm - feedback 34 Diaphragm - sense 54 Seal - thread

14

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

13

34

19

16

Detail A

28

40

39

Vacuum actuator connection

Detail B

15

14

15

17

Remote vacuum
sense ⅜” NPT

1

27

26

Detail C

PARTS

Item Description

13 Bolt
14 Plate, diaphragm support
15 Gasket, diaphragm case
16 Washer, lock
17 Nut
19 Diaphragm, feedback
29 Vent
34 Diaphragm, sense
39 Ferrule, tubing
40 Retainer, dome tubing
44 Bushing

FIGURE 8

3.2 Pilot assembly for non-flowing modulating
pilots (Series 400B)

Assembly is done in the reverse order of
disassembly.

1. Lubricate all O-rings, sliding surfaces,
screw threads and spring washer pivot
points with Dow Corning No. 33 silicone
grease or equivalent.

Note: for oxygen service valves use only

lubricants suitable for this service, such as
Krytox 240AC.

2. The spindle O-ring and bearing surface should
be lubricated with Dow Corning FS 3451 or
equivalent.

Note: do not lubricate inlet or outlet seat

O-rings

3. Assemble the diaphragm lower case (2) to
the body (1).

Note: for Pilots with Kalrez

®

O-rings, use
two PTFE gaskets (37) between the lower
diaphragm case (2) and the body (1).

44

29

Detail D

4. Assemble the inlet screen (41) to the inlet
connector (26) and the inlet connector (26)
to the body (1).

5. Assemble the inlet seat (upper O-ring [-014])
(UPPER 32) and the spindle O-ring (23) to
the spindle (24).

6. Assemble the spindle (24) to the spool (36)
and install the outlet seat (lower O-ring
[-014]) (LOWER 32) to the spindle (24).

NOTE

Kalrez® is a registered trademark of DuPont Dow
Elastomers.

15

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

7. Install the spool (36) with spindle (24) in
thebody (1). Position the spool (36) to
engage the anti-rotation groove pin (21).

8. Install a diaphragm case gasket (15) on
thelower diaphragm case (2) and the
feedback diaphragm support plate (14).

Note: install the support plate (14) with

the rounded edge up towards the feedback
diaphragm (38).

9. Install the following parts in the order listed
on the spool (36):

a. Feedback diaphragm support plate (14)
b. Gasket (15)
c. Feedback diaphragm (38)
d. Diaphragm (19)
e. Lantern ring (35)
f. Gasket (15)
g. Sense diaphragm (34)
h. Sense plate (33)

Note: install the sense plate (33) with the round
edge towards the sense diaphragm (34).

i. Install -022 O-ring (18) around

thespindle. On the sense, add plenty of
lubricant to the O-ring.

10. Install bonnet studs (43) thru upper
diaphragm case (3). Install the upper
diaphragm case (3), case bolts (13, 48),
washers (16, 50), and nuts (17, 49).

11. Install the spindle spring (3) and spool
retainer nut (30). Lube nut with Dow
Corning 33 on bevel and use Fluorolube
on the threads. Push down on the spool
retainer nut (30) with a Phillips screw driver
engaging the anti-rotation pin (21) and
tighten the nut to 10 foot pounds using ½”
open end wrench.

Note: do not over tighten, the diaphragms

may be damaged.

12. Pretest pilot function by depressing
spindle/diaphragm assembly stack
downward. The spindle spring should return
the stack assembly to the upward position.
If it doesn’t return to upward position,
disassemble pilot and re-check assembly.

13. Install spring (9), spring washer (8), bonnet
gasket (12) and bonnet (4) onto upper
diaphragm case (3). Install bonnet washers
(10,53) and nuts (11) and tighten.

14. Install pressure adjustment screw (6),
locknut (7) and cap (5).

This pilot is now ready for testing.

3.3 Pilot disassembly for flowing modulating

or snap action pilots (Series 91, 93, and 93T)
refer to Figures 9 thru 13

The pilot disassembly instructions and soft
goods vary between pilot series. Pay particular
attention to orientation of parts and materials.
The 93T pilot has all PTFE soft goods including
diaphragms, and its maximum set pressure
is 15 psig. The 91 pilot has PTFE soft goods
with stainless steel (SS), Hastelloy
diaphragms, and its set pressure ranges from
16 psig to 50 psig. The 93 pilot is different from

®

, and PTFE

the 93T and 91 pilot in that it uses elastomer
seat, seals and diaphragms.

1. Remove cap (760) and adjusting screw (790)
and adjusting screw seal (720) for vacuum
pilot. Remove bonnet bolts (770), seals (700)
for vacuum pilot, bonnet (200), spring (840)
and spring washer (820).

2. On Series 91 and 93T pilots, loosen boost
tube fitting (310) on boost tube (320) at boost
tube connector bolt (270). Refer to detailB.
Remove boost tube connector nut (300),
washer (290), lover boost tube seal (590),
seal retainer (280). Let these three parts
slide down boost tube. Remove boost tube
connector bolt (270), upper boost tube seal
(590) and seal retainer (280).

3. On Series 93 pilot, loosen boost tube fitting
(310) on boost tube (320) at boost tube
connector bolt (270). Refer to detail B.
Remove boost tube connector nut (300),
washer (290), lover boost tube seal (600)
Letthese three parts slide down boost tube.
Remove boost tube connector bolt (270) and
upper boost tube seal (590).

4. Remove case bolt nuts (260), washer (250)
and bolts (240). Remove upper case (210).

5. On Series 91 and 93T pilot. Hold hex spacer
(120) with a shortwell ¾” socket that has
theratchet area bored out and inserting
another socket into the bored out hole, loosen.

6. Remove parts in the following order: hex
spacer (120), sense plate (150), upper gasket
(650), sense diaphragm case gasket
spindle gasket (680), sense spacer (140),
plate (160), spacer ring (230), diaphragm
gasket (620), boost diaphragm gasket (680)
(See Figure 12, detail A)

7. On Series 93 pilot. Hold hex spacer (120)
with a shortwell ¾” socket that has the
ratchet area bored out and inserting another
socket into the bored out hole, loosen.

8. Remove parts in the following order: hex
spacer (120), sense plate (150),sense
diaphragm (510), upper gasket (650), sense
spacer (140), boost plate (160), spacer
ring (230), diaphragm gasket (620), boost
diaphragm gasket (510), boost spacer (130),
check plate (560) and spindle seal (660).
(See figure 12, detail A)

9. Remove boost tube (320) from body (100)
and lower boost tube seal (590/600(93T))
from boost tube (320).

10. Remove spindle diaphragm (500) and gasket
(690) for 93T pilot and spindle/disc assembly
(550) from body (100).

11. Remove spindle diaphragm plate (170) and
shim washer(s) (490) from spindle/seat
assembly (550).

Note: shim washer(s) may not always be

used in assembly (550).

12. Refer to detail A. For the 93T pilot seat
assembly, remove the retainer ring (430)
and seat retainer (420) from the spindle/disc
assembly (550). Remove the seat (570).

(650),

boost

16

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

13. Remove blowdown bushing (390) and
blowdown seal (630) from body (100).

Note: the blowdown screw retainer (380)

is a loose fit on the blowdown adjustment
screw (350). Be prepared to catch it
when the bushing (390) is removed from
thebody(100).

14. Loosen the blowdown screw locknut (370)
and remove the blowdown adjusting screw
(350) and seal (630) from the bushing (390).

15. Remove the vent (800) from the body (100).

Note: it is not necessary to remove

thefilter screen (400) or nozzle (110) from
thebody(100).

16. Clean all parts and replace all soft goods.
The spindle/seat assembly (550) is factory
assembled and must be replaced as a unit.
If the nozzle (110) is nicked or scratched,
it should be replaced. To remove it, use a
deepsocket.

3.4 Pilot assembly for flowing modulating or

snap action pilots (Series 91, 93, and 93T)

1. On Series 93 and PTFE seat Series 91
and93T pilots, if you removed the nozzle
(110), reattach the nozzle (110) to the body
(100), and replace the spindle seat assembly
(550).

2. If you removed the filter screen (400),
reattach the filter screen (400), and reattach
the vent (800) to the body (100).

3. Reattach the blowdown seal (620), and
blowdown adjusting screw (350) to
theblowdown bushing (390), and tighten
theblowdown nut (370).

Note: make sure the blowdown screw

retainer (380) is on the blowdown
adjustment screw (350).

4. Attach the bushing seal (630) and the
blowdown bushing (390) to the body (100).

5. Place the shim washer(s) (490), if applicable,
and spindle spacer (170) on the spindle seat
assembly (550). Then place the spindle seat
assembly (550) in the body (100).

6. Lay a straight edge across the body (100)
and check the gap between the straight
edge and the spindle spacer (170). Add or
remove shim(s) (490) as required to make
the top of the spindle spacer (170) even with
the top of the body (100).

7. Align the small hole in the lower diaphragm
case (220) with the hole in the spindle
diaphragm (500). Then align the spindle
diaphragm hole (500) with the hole in the
body (100). Install the lower case (220), body
bolts (340) and bolt seals (610) onto the body
(100) and tighten together.

Note: on the 91 and 93T pilots, there are

gaskets (690) on each side of the spindle
diaphragm (500) and a diaphragm case plate
(180) that must be installed onto the lower
case (220) using the spiral pin (410).

8. On Series 91 and 93T pilots, slide the hex
nut (300), flat washer (290), seal retainer
(280), and seal boost tube (590) on to the
boost tube (320).

On Series 93 pilots, slide the hex nut (300),

flat washer (290), and thread seal (600)
on to the boost tube (320). Then attach
the boost tube (320) to the body (100) with
theconnector (330).

9. On Series 91 and 93T pilots, install parts in
the following order: spindle seal (660), boost
spacer (130), diaphragm case gasket (640),
boost diaphragm (510/520), diaphragm
case gasket (larger I. D. hole) (640),
spacer ring (230), boost plate (160),
spacer (140), diaphragm case gasket (640),
sensediaphragm (510), diaphragm gasket
(smaller I.D. hole)(640), sense gasket (670),
sense plate (150), hex spacer (120), springdisc
(830), lock washer (780) and jam nut (750).

Note: be sure to align large hole in

diaphragm(s) (510/520) and gaskets
(ALL640) with the boost tube hole (270).

10.

On Series 93 pilot, install parts in
thefollowing order: spindle seal (660),
checkplate (rubber side down) (560),
boost spacer (130), boost diaphragm (510),
diaphragm gasket (650), spacer ring (230),
boost plate (160), sense spacer (140),
diaphragm gasket (650), sense diaphragm
(510), sense plate (150), hex washer (120),
spring disc (830),
nut (750).

Note: be sure to align large hole in

diaphragm(s) (510) and gaskets (ALL 650)
with the boost tube (270) hole.

11. To tighten spindle (550) and diaphragm
assembly, hold ¾” socket tool onto hex
washer (120) stationary, and tighten the jam
nut (750).

12. Install upper diaphragm case (210), case
bolts (240), washers (250) and nuts (260),
and tighten.

13. Install the upper boost tube seal (590)
(Series93 pilot), PTFE seal (590) and seal
retainer (280) (Series 91 and 93T pilot),
andboost tube connector/bolt (270) into
thelarge hole of the diaphragm cases
(210,220). Slide
(600) (Series93 pilot),
seal retainer (280) (Series 91 and 93T pilot),
washer (290), nut (300), and boost tube
connector nut (310/480) up the boost tube
(320) attach to the boost tube connector/
bolt (270). Tighten boost tube fitting (310)
on the boost tube (320) at the boost tube
connector/bolt (270).

14. Install the spring (840), spring washer (820),
bonnet assembly (200), and bonnet bolts
(770), adjusting screw (790), locknut (190),
and cap (760).

Note: for the vacuum pilot remember to

replace bonnet bolt (700), bonnet gasket
(580) and adjusting screw seal (720).

lock washer (780), and jam

the lower boost tube seal

PTFE seal (590) and

sense

17

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

PILOT PARTS (FIGURES 9, 10, 11)

Item Description

100 Body
110 Nozzle
120 Spacer - hex
130 Spacer - boost
140 Spacer sense
150 Sense plate
160 Plate - boost
170 Spacer - spindle
180 Plate - diaphragm case (93T only)
190 Pressure adjustment lock nut
200 Bonnet assembly (items 450 - 710 part of assembly)
210 Diaphragm case upper
220 Diaphragm case lower
230 Ring - spacer
240 Case - bolt
250 Case washer - lock
260 Case nut - hex
270 Connector - boost tube
280 Seal - retainer (93T only)
290 Washer - flat
300 Nut - hex
310 Nut - connector
320 Tube - boost
330 Connector - straight
340 Bolt - body
350 Needle - blowdown adjustment
370 Blowdown nut
380 Blowdown retainer
390 Blowdown bushing
400 Screen filter
410 Pin - spiral (93T only)
430 Ring - retainer (93T only)
440 Nut - swage (93T only)
450 Insert - bonnet (part of item 200 assembly)
460 Wire
470 Seal - ½” dia
480 Ferrule (not shown)

Item Description

490 Washer - shim (for stack height only)
500 Diaphragm - spindle
510 Diaphragm - sense/boost
520 Diaphragm - sense (93T only)
550 Spindle
560 Plate - check
570 Seat
580 Gasket - bonnet
590 Seal - boost tube
600 Seal - thread
610 Seal - body bolt
620 Seal - blowdown
630 Seal - bushing
640 Gasket - case
650 Gasket - diaphragm
660 Seal - spindle
670 Gasket - sense (93T only)
680 Gasket - spindle (93T only)
690 Gasket - spindle diaphragm used if item 500 is PTFE)
700 Seal - bonnet bolt (93T only)
710 Seal - bonnet insert (part of item 200 assembly vacuum only)
720 Seal adjustment screw (93T only)
730 Base - seat (93T only)
740 Ball
750 Nut - hex
760 Cap
770 Bolt - bonnet
780 Washer - lock
790 Pressure adjustment screw
800 Vent - body (dependent on configuration of assembly)
810 Vent - bonnet
820 Washer - spring
830 Disc spring
840 Spring
910 Name plate (not shown)
920 Screw - drive (not shown)

18

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

450

460

See detail B
Figure 13

230

150 210 470

160

320

220

440

770

A

180

See detail A
Figure 13

580

500
690

520
510

240
250
260

640

410

A

Exhaust

See Figure 7 or 8

800

630

380

390

100

To main valve dome

350

620

340 610

370

FIGURE 9

Series 93 and 93T pressure pilot (below 15 psig)

330

400

To process

View A - A

19

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

820 790

840

750
780

830

470

150

520

240
250
260

640

680

A

460

760

190

450

200

120

770

810

140

580

160

210

230

220

510

690

See detail A
Figure 13

380

330

320

620

400

350

340610

800

A

100

370

390

630

View A - A

FIGURE 10
Series 91 and 93 pressure pilot (Above 15 psig)

20

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

To process

To process

See detail B

See detail A

Main valve dome

FIGURE 11
Series 93 vacuum pilot

21

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

Detail A

Series 93 - pressure

above 15 psig

Detail A

Series 91 - pressure

above 15 psig

FIGURE 12

Detail A

Series 93 - pressure

below 15 psig and vacuum

Detail A

Series 93T - pressure

below15psig

22

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

270 270

210

650

230

650

220

600

290

300

310
480

590

510
520

210

640

220

280

280

590

670

510
520

590

290

300

310
480

FIGURE 13

Detail B

Series 93 pilot - pressure

below 15 psig and vacuum

Detail B

Series 93 pilot - pressure

below 15 psig

23

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

3.5 Pilot adjustment for non-flowing
modulating pilots (Series 400B)

The pilot may be set separate from the main
valve provided there is access to a pilot test
system similar to the one shown in Figure 14.

3.5.1 Adjustment of set pressure

1. Install the pilot valve onto the pilot test
system and attach gage sensing lines to
thesupply and dome connections.

2. Remove cap.

3. Screw the set pressure adjustment screw
clockwise until it is screwed IN 80% to 90%.

4. Increase the supply pressure to nameplate
setting and slowly back out the adjustment
screw until flow through the pilot exhaust
begins.

5. Continue to back the set pressure
adjustment screw out until the dome
pressure is 70% of the supply pressure.
When the dome pressure reaches 70% of
the supply pressure read the supply gage
pressure. If it is below set pressure, youwill
need to tighten down on the pressure screw,
or back off it if you are high. Tighten the locknut
once the desired set pressure is achieved.

Note: adjust the set pressure for 101% ± 1%

of the nameplate set pressure.

6. Cycle the pilot valve a minimum of 5times
to assure that the dome pressure reduction
at set pressure is consistent. Increase
thepressure very slowly in order to obtain
an accurate reading of thecracking
pressure and to expose any erratic
performance.

Note: cracking pressure on vacuum pilots

is that pressure at which the initial dome
pressure change is noted.

7. Hold the pilot valve at set pressure to obtain
the dome pressure reading.

Note: the first 6 steps should be

completed before this step is undertaken.
Inmodulating 400B pilots, the dome
pressure decreases proportional to increase
in inlet pressure.

Full dome reduction (dome pressure)

occurs ≤ 6% over pressure.

8. Check the pilot exhaust for leakage when
the pilot is in null position between crack
and reseat.

Note: maximum leakage allowed is

60bubbles per minute.

3.5.2 Reseat pressure

Reseat is defined as that supply pressure when
the dome pressure is 75% of the supply pressure.
Note: blowdown adjustment is not required on
Series 400B pilots.

3.5.3 ADJUSTMENT TOLERANCES

Pressure Tolerance

Set pressure ± 3%
Crack pressure 98% of set
Reseat pressure 96% of set

24

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

Set pressure adjustment

Supply pressure gauge

Supply
pressure

Supply vacuum gauge

½” Pipe (min)

Vent

Accumulator .25 ft

Supply port (½” NPT)

Positive pressure pilot

Vacuum set adjustment

⅜” Pipe (min)

3

[.007 m3]

Test pilot

Reseat pressure adjustment

Dome pressure gauge

Test pilot

Supply vacuum

FIGURE 14

Vent

Accumulator .25 ft

Supply port (⅜” NPT)

Negative pressure pilot

3

[.007 m3]

Reseat vacuum
adjustment on back side

Dome vacuum gauge

25

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

3.6 Pilot adjustment for flowing modulating or

snap action pilots (Series 91, 93, and 93T pilots)

The pilot may be set separate from the main
valve provided there is access to a pilot test
system similar to the one shown in Figure 14.

3.6.1 Adjustment of set pressure

1. Install the pilot valve onto the pilot test
system, and attach gage sensing lines to
thesupply and dome connections.

2. Remove the cap.

3. Screw the set pressure adjustment screw
clockwise until it is screwed in 80% to 90%.

4. Increase the supply pressure to nameplate
setting and slowly back out the set pressure
adjustment screw until flow through the pilot
exhaust begins.

5.

Continue to back the set pressure adjustment
screw out until the dome pressure is 70%
of the supply pressure.

When the dome
pressure reaches 70% of the supply
pressure read the supply gage pressure.
If it is below set pressure, you will need to
tighten down on the pressure screw, or back
off it if you are high. Tighten the locknut
once the desired set pressure is achieved.

Note: set pressure on a vacuum pilot is

evidenced by a rapid change of the dome
pressure (0 gage) to the supply pressure.
Aslow ramp speed is recommended on low
set valves in order to obtain true reading of
set pressure.

6. Check the pilot exhaust vent for leakage.
The pilot shall be bubble tight up to crack
pressure shown in 3.6.3. Also, check upper
pilot vent for leakage. There should be
0leakage from the upper vent.

3.6.2 Reseat pressure

1. Turn the blowdown adjusting screw
clockwise to decrease the reseat pressure
or counterclockwise to increase the reseat
pressure.

2.

A small interaction between set pressure
and reseat pressure adjustments will occur;
therefore, it may be necessary to readjust
theset pressure after setting reseat

pressure.

Note: if the blowdown adjusting screw has

been removed or turned to either extreme,
positioning it midway will aid in obtaining
the correct reseat pressure. There are
approximately 7 to 8 turns to obtain full travel
of the adjustment. Midway from either end
should produce a blowdown for snap action.

For modulating pilot action, back the

adjustment screw out counterclockwise.

3. Cycle the pilot valve a minimum of 5
times to assure that dome pressure
reduction at set pressure is consistent.
Increasethepressure very slowly in order to
obtain an accurate reading of thecracking
pressure and to expose any erratic
performance.

Note: cracking pressure on vacuum pilots

is that pressure at which the initial dome
pressure change is noted.

4. Hold the pilot valve at set pressure to obtain
the dome pressure reading. For modulating
pilots, dome pressure shall be read with
theinlet at 105% of set pressure.

Note: the first 4 steps should be completed

before this step is undertaken.

On snap action pilots, the dome pressure

decreases rapidly with a “snap” to
15% ± 10% of set pressure.

On modulating action pilots (Series 90),

the dome pressure decreases slowly to
30% ± 5% of set pressure and recovers to
60% ± 10% of set pressure at set pressure.

5. After desired pilot action is set, verify pilot
seat tightness. This is accomplished by
checking the pilot exhaust vent for leakage.
The pilot should be bubble tight up to crack
pressure as shown in 3.6.3. Be aware
of crack pressure changes between set
pressure ranges.

3.6.3 ADJUSTMENT TOLERANCES

Set press.

Pilot action Set press.

Snap 4” WC to 7” WC ± .2” WC 75% 90% ± 1
Snap 7” WC to 1.0 psig ± 3% 90% 90% ± 1
Snap Above 1 psig ± 3% 95% 92% ± 1
Snap -4” WC to -7” WC ± .2” WC 75% 90% ± 1
Snap -7” WC to -1.0 psig ± 3% 90% 90% ± 1
Snap -1 PSI to -14.7 psig ± 3% 95% 92% ± 1
Modulating action 4” WC to 7” WC ± .2” WC 75% 100%
Modulating action 7” WC to 1.0 psig ± 3% 90% 100%
Modulating action Above 1.0 psig ± 3% 95% 100%
Modulating action -4” WC to -7” WC ± .2” WC 75% 100%
Modulating action -7” WC to -1.0 psig ± 3% 90% 100%
Modulating action -1.0 PSI to -14.7 psig ± 3% 95% 100%

tolerances

Crack press.
% set

Reseat press.
% set

26

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

4 FUNCTIONAL TESTING OF COMPLETE
ASSEMBLY OF MAIN VALVE AND PILOT

4.1 General

Assemble the pilot to the main valve, and
install remaining tubing and accessories.
Thecomplete valve assembly should be leak
tested for internal and external leaks using
apressure equal to 30% and 90% of set.

4.1.1 Leakage check - pressure relief valves

Apply pressure to the inlet equal to 30% of
theset pressure. Check for leakage at the
main valve seat, no visible leakage shall occur.
Holdtime is 1 minute.
Increase the inlet pressure to 90% of the set
pressure. Check for leakage at the cap seal,
casting, pilot support pipe and supply tube and
other applicable connections using leak test
solution and at the main valve seat. No visible
leakage shall occur for a hold time of 1 minute.

4.1.2 Leakage check - vacuum relief valves

Valves equipped with vacuum pilots shall be
leak tested per 4.1.1 on positive pressure with
the set pressure equal to the reciprocal of
thevacuum set pressure. Valves with weighted
diaphragms shall be tested for leakage at 50%
of their weighted set.

4.1.3 Back flow preventers and/or field test

The use of some field test connection or
back flow preventers necessitates the use of
check valves. These valves shall be installed
per theapplicable assembly drawings and in
thefree flow direction shall open at less than
.5” W.C. The check valves may be tested for
forward flow either before or after assembly
at the shops option. The output check valve of
back flow preventers shall be checked for zero
leakage per 4.1.1 paragraph 2.

4.2 Leakage check - pressure relief valves
pressure pilot (Series 400B pilot)

1. Connect gas bottle as shown in Figure 15.

2. Close valve “C”.

3. Open block valve “B” to supply regulator.
Note: regulator pressure should be set at 0.

4. Connect bubble tester bottle to pilot exhaust
vent and block the second pilot vent if
thepilot is equipped with one.

5. Increase pressure at field test port to
slightly above tank pressure by slowly
increasing regulated pressure.

6. Open field test valve “A” and slowly increase
regulator pressure until bubbles are seen in
the bottle. That pressure will be within 3% of
the set pressure.

7. To remove the test set-up, close valves “A”
and “B” and open valve “C”.

27

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

Pressure regulator w/
test gauge or manometer

Field test valve “A”

Vent valve “C”

Block valve “B”

Compressed nitrogen

FIGURE 15

4.3 Field test instructions for flowing

modulating or snap action pilots

4.3.1 General

An optional field test accessory is available
for checking the positive set pressure without
removing the valve from service. The field test
accessory consists of a 3-way ball valve to allow
the pilot to sense pressure from either the
process or from the test gas source.
A standard bottle of nitrogen equipped with
a pressure regulator, block valve, pressure
gage, and convenient length of high pressure
flexible hose is recommended for testing. A set
up similar to that shown in Figure 13 should be
used. Such a test kit is available from Anderson
Greenwood under the part number 04.4812.001
plus additional dash numbers for the pressure
gages required.

Remote sense connection
(to tank)

5. Increase pressure at field test port to
slightly above tank pressure by slowly
increasing regulated pressure.

6. Open field test valve “A” and slowly increase
regulator pressure until bubbles are seen in
the bottle. That pressure will be within 10%
of the set pressure.

Note: for pilots adjusted for snap action, the

main valve seat will open at set pressure
if the tank pressure is present. If it is not,
asudden increase in pilot exhaust flow will
be observed at set pressure.

7. To remove the test set-up, close valves “A”
and “B” and open valve “C”.

4.3.2 Field test procedure for flowing modulating
or snap action pilots

1.

Connect the gas bottle as shown in Figure 16.

2. Close vent valve “C”.

3. Open block valve “B” to supply regulator.
Note: regulator pressure should be set at 0.

4. Connect bubble tester bottle to pilot exhaust
vent.

28

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

5 STORAGE AND HANDLING

Because cleanliness is essential to
thesatisfactory operation and tightness of
a Series 9000 pilot operated relief valve,
precautions should be taken to keep out all
foreign particles and materials. Valves should
be closed off properly at both the valve inlet
and outlet. Particular care should be taken
to keep the valve inlet absolutely clean.
Valvesshould preferably be stored indoors
with the original factory installed protective
measures left in place. This includes all
desiccants, flange protectors, and factory seals.

FIGURE 16

Valves should be placed on wooden pallets
or other blocking materials to keep them off
the floor or in a location where dirt and other
forms of contamination are kept to a minimum.
Valvesshould not be thrown in a pile or laid on
the bare ground waiting for installation.

Field test valve “B”

Flexible hose

Test gauge

Nitrogen

bottle

Block valve
“A”

Block valve
“C”

29

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

6 TROUBLE SHOOTING

Problem Possible cause Resolution

1. Valve opens below set 1. Improper installation of sense line 1. Verify if sense line is installed properly

2. Plugged sense line 2. Check sense line, inlet screen, and dipper tube for cleanliness

3. Improper gauge accuracy and/or location 3. Verify gauge accuracy for valve being tested and ensure
location is at valve being tested

2. Pilot leaks from upper vent 1. Sense diaphragm failure 1. Replace diaphragm

2. Spindle lock nut loose 2. Tighten spindle lock nut

3. Pilot leaks from lower vent 1. Pilot seat leakage 1. On the 93 pilot, replace spindle disc assembly.
On the 93T and 91 pilots, replace seat.
Inspect nozzle and relap if necessary

2. Nozzle over tightened 2. Tighten nozzle per assembly instructions

4. Main valve leaks 1. Seat film damaged 1. Replace seat film

2. Nozzle damaged 2. Inspect nozzle and relap if necessary

3. Nozzle seal damaged, missing, or out of place 3. Position nozzle seal per assembly instructions

4. Seat plate assembly is loose 4. Tighten seat plate assembly

5. Operating too close to set pressure (above 96%) 5. Lower operating pressure

6. Main valve diaphragm failure 6. Replace diaphragm

7. Diaphragm assembly loose 7. Tighten diaphragm assembly

8. Seat plate not fully threaded on hub 8. Install seat per assembly instructions

7 MAIN VALVE SPARE PARTS AND REPAIR KITS

Soft goods repair kits contain all thediaphragms,
seals, and seats to a repair valve. To orderakit,
specify the base number and select thelast
three digits from the following tables.
Toensure the purchase of the correct
repair kit, the order should specify the valve
model and serial number. For chloride rich
environments, the bolts in the main valve and
pilot exposed to the environment should be
replaced during routine maintenance or at least
every 5 years.

7.1 - SERIES 9300 MAIN VALVE SINGLE CHAMBER DIAPHRAGM REPAIR KIT (06.0235.XXX)

Kit type Internals Materials 2” 3” 4” 6” 8” 10” 12”

Soft goods Aluminum PTFE 319 321 323 526 327 329 331
Soft goods SST-LP PTFE 496 498 500 527 504 506 508
Soft goods SST-HP PTFE 356 360 364 528 372 376 380
Bolt Aluminum SST 332 333 334 335 336 337 338
Bolt SST-LP SST 339 340 341 342 343 344 345
Bolt SST-HP <15 psig SST 346 347 348 570 350 351 352
Bolt SST-HP ≥15 psig SST 346 347 348 349 350 351 352
Bolt SST Marine SST 624 625 626 627 628 629 630
Bolt SST Marine certs SST - - - 631 632 633 634

7.2 - SERIES 9300 MAIN VALVE DUAL CHAMBER DIAPHRAGM REPAIR KIT (06.0235.XXX))

Kit type Internals Materials 2” 3” 4” 6” 8” 10” 12”

Soft goods Aluminum PTFE/Kalrez®382 384 386 388 390 392 394
Soft goods SST PTFE/Kalrez®545 547 549 551 553 555 557
Bolt Aluminum SST 395 396 397 398 399 400 401
Bolt SST SST 402 403 404 405 406 407 408

30

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

8 PILOT SPARE PARTS AND REPAIR KITS

8.1 - 91 PILOT REPAIR KIT (04.4744.XXX)

Pilot type Pressure Kit type Material Pressure

91 Pilot 15 - 50 psig Soft goods PTFE/Stainless 003

8.2 - 93 PILOT REPAIR KIT (06.0235.XXX)

Pilot Series Pressure Kit type Material Pressure Vacuum

93 Pilot 4”WC - 14.9 psig Soft goods NBR 133 152
93 Pilot 4”WC - 14.9 psig Soft goods FKM 134 153
93 Pilot 4”WC - 14.9 psig Soft goods EPR 135 154
93 Pilot 4”WC - 14.9 psig Soft goods NBR
93 Pilot 4”WC - 14.9 psig Soft goods FKM
93 Pilot 4”WC - 14.9 psig Soft goods EPR
93 Pilot 4”WC - 14.9 psig Bolt SST 287 287
93 Pilot marine 4”WC - 14.9 psig Bolt SST 702 702
93 Pilot 15 - 50 psig* Soft goods NBR 141 ­93 Pilot 15 - 50 psig* Soft goods FKM 142 ­93 Pilot 15 - 50 psig* Soft goods EPR 143 ­93 Pilot 15 - 50 psig* Bolt SST 416 -

1. PTFE diaphragm
* (3 - 50 psig marine)

[1]

[1]

[1]

136 155
137 156
138 157

8.3 - 93T PILOT REPAIR KIT (06.0235.XXX)

Pilot Series Pressure Kit type Material Pressure Vacuum

93T Pilot 4”WC - 15 psig Soft goods PTFE 139 158
93T Pilot 4”WC - 15 psig Bolt SST 288 288
93T Pilot marine 4”WC - 15 psig Bolt SST 701 701

8.4 - 400A/B PILOT REPAIR KIT (06.0235.XXX)

Pilot Series Pressure Kit type Material Pressure Vacuum

400A/B Pilot 4”WC - 10”WC Soft goods NBR
400A/B Pilot 4”WC - 10”WC Soft goods FKM
400A/B Pilot 4”WC - 10”WC Soft goods EPR
400A/B Pilot 4”WC - 10”WC Soft goods Kalrez
400A/B Pilot >10” WC - 15 psig Soft goods NBR
400A/B Pilot >10” WC - 15 psig Soft goods FKM
400A/B Pilot >10” WC - 15 psig Soft goods EPR
400A/B Pilot >10” WC - 15 psig Soft goods Kalrez®
400A/B Pilot 4” WC - 15 psig Bolt SST 409 409

1. PTFE diaphragm

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

127 149
128 150
129 151
455 456
558 562
559 563
560 564
561 565

8.5 - 400A PILOT REPAIR KIT (06.0235.000)

Pilot Series Pressure Kit type Material Pressure Vacuum

400A Pilot 15 - 50 psig Soft goods NBR
400A Pilot 15 - 50 psig Soft goods FKM
400A Pilot 15 - 50 psig Soft goods EPR
400A Pilot 15 - 50 psig Soft goods Kalrez®
400A Pilot 15 - 50 psig Bolt SST 462 -

1. PTFE diaphragm

[1]

[1]

[1]

[1]

458 ­459 ­460 ­461 -

NOTES

®

Kalrez

is a registered trademark of DuPont Dow Elastomers

31

ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

9 ACCESSORIES, OPTIONS AND ACCESSORY
REPAIR KIT

9.1 Accessories

1. Field test connection

• In-service verification of set pressure.

• Simplifies the periodic testing of pressure

relief valves.

2. Backflow preventer

• Prevents accidental reverse flow through

pressure relief valve.

9.2 Options

1. Manual unloader

• Permits the pressure relief valve to be opened

at pressures below the nameplate setting.

• Acts as manual override to normal

pressure setting, but has no effect on the
sealed pressure setting.

2. Remote unloader

• Permits the pressure relief valve to be

remotely opened to depressurize the
system.

3. Pilot exhaust tubed to main valve outlet
(PEMVO)

• Eliminates any local venting of fluid media

from pilot.

4. Remote pressure sense connection

• Pressure relief valve will respond to actual

system pressure conditions.

• Eliminates undesirable cycling due to

excessive inlet pressure losses.

• Improves safety under adverse operating

conditions.

9.3 - ACCESSORY REPAIR KIT (06.0235.XXX)

Accessory Kit type Material Dash number

Shuttle check Soft goods PTFE 140
Shuttle check Bolt SST 410
Diaphragm Soft goods PTFE 144
Diaphragm Bolt SST 414
Ball check Soft goods NBR 145
Ball check Soft goods FKM 146
Ball check Soft goods EPR 147
Ball check Soft goods Kalrez

®

148

10 LUBRICANT AND SEALANTS FOR SERIES 9300

(Only include lubricants referenced in the manual)

10.1 - LUBRICANTS USED ON PILOT PARTS

Pilot parts Description Lubricant

Pressure adjustment, screw and locknut Threads Dow corning 33, #05.1500.012
Diaphragm and gaskets (91 and 93T pilots) Seal surfaces between

cases and spacer ring
Stainless steel case, bolts and nuts Threads Fluorolube LG 160, #05.1500.023
Carbon steel case bolts Threads Dow corning 33, #05.1500.012
Stainless to aluminum or aluminum parts Threads Dow corning 33, #05.1500.012
Sliding seals PTFE or elastomer Dow corning 33, #05.1500.012
Pipe fittings and vents Threads PTFE Tape and dow corning 33,

1. For oxygen service use Krytoc 240AC

Slick stuff, #05.1500.015

#05.1500.012

10.2 - LUBRICANTS AND SEALANTS USED ON MAIN VALVE PARTS

Main valve parts Description Lubricant

Carbon steel bolts, screws and nuts, fittings Threads Dow corning 33,

#05.1500.012
Stainless on stainless bolts, screws, nuts and
fittings
Diaphragms and gaskets (91 and 93T) Seal surfaces

Seat hub and jam nut Threads - Loctite
Shaft assembly and diaphragm Assembly jam nut
Sliding seals PTFE and elastomers Dow corning 33,

Pipe fittings and vents Threads PTFE Tape and

1. For oxygen service use Krytoc 240AC

Threads Fluorolube LG 160,

#05.1500.023

Slick Stuff #4,

between diaphragm
and cases

Threads - Loctite

#05.1500.015

#05.1500.012

dow corning 33,

#05.1500.012

[1]

[1]

Sealant

-

-

-

-

-

© 2017 Emerson. All rights reserved.

32