Installation, Operation and Maintenance Manual for
Pilot Operated Pressure/Vacuum Relief Valves
Models 1660A, 1661A, 1662A
IOM-1660A
Rev. D 12541
©2010 Groth Corporation
Ref. ID: 96561
TABLE OF CONTENTS
Description Pg.
Introduction 2
Safety Warnings 4
Inspection and Storage 4
Installation 5
Troubleshooting Guide 6
Maintenance 6
Tools 7
Disassembly 7
Replacement Parts 8
Film Seat Pallet 9
O-Ring Seat Pallet 10
Storage tanks are pressurized when liquid is
pumped in, compressing the existing vapor or
when increasing temperature causes
increased evaporation or expansion of
existing vapor. Conversely, vacuum may be
created when pumping out or due to
decreasing temperature. To prevent damage,
vapor must be allowed to escape or enter the
tank at a specified pressure or vacuum
condition. The volume rate of venting
depends upon tank size, volatility of contents,
pumping rate and temperature. See API
Standard 2000 for the procedures to
determine venting requirements.
Assembly 10
Drawings & Bill of Materials 12
Model Number 16
Product Limited Warranty 16
List of Figures
1 Tank Installation - Safety Eq 3
2 Nameplate 3
3 Suggested Tank Nozzle Dsgn 5
4 Film Pallet Assembly 9,13
5 O-Ring Pallet Assembly 10,13
6 Spindle Assembly-
10
Model 1660A
7 Spindle Assembly-
10
Models 1661A-1662A
8 Model 1402A Pilot Connection 11
9 Model 1661A with 1401E Pilot 12
10 Jackscrew Assembly 14
11 Model 1661A w/ 1402A Pilot 14
12 Model 1662A w/ 1401EV Pilot 15
List of Tables
1 1660A Series Pilot Operated
3
Valve Models
2 Inlet/Outlet Flange Gasket
5
Dimensions
3 Bolt Torque-Flat Face Flange 6
4 Bolt Torque-Raised Face
6
Flange
5 Soft Goods Kits 8
6 FEP Seat Film Dimensions 9
7 Bill of Materials 13
INTRODUCTION
Pressure and/or vacuum relief valves are
used on liquid storage tanks and other
process vessels or systems to prevent
structural damage due to excess internal
pressure or vacuum.
The pilot operated relief valve has two
principal advantages over other types of relief
valves:
1) It is bubble tight to set pressure.
2) It is fully open at less than 10% above set
pressure.
These characteristics permit operating
pressures nearer to the maximum allowable
working pressure of the tank. High operating
pressures reduce evaporation and total
venting volume, thereby reducing product loss
and the cost of processing emissions. A tank
may also have provisions for emergency
pressure relief due to fire exposure and/or
inert gas blanketing of the vapor space. A
typical tank installation is shown in Figure 1
which includes a 1661A Pilot Operated
Pressure-Vacuum Relief Valve, a 3011H
Blanket Gas Regulator and a 2500 Pilot
Operated Valve which provides emergency
pressure and/or additional vacuum relief.
Groth Corporation manufactures all of these
devices.
A Pilot Operated Valve (POV) must be
carefully maintained by a qualified valve
technician. It should only be assembled under
clean conditions, preferably in a service shop
environment. Carefully read and understand
this manual before attempting to repair a
1660A series POV. Groth Corporation
provides repair services for all products
manufactured by Groth Products Group.
The 1660A Series Pilot Operated Valve is
designed to provide both pressure and
vacuum relief for API 620 and 650 tanks and
other storage and process vessels. Several
configurations are available; these are
Page 2 of 16
.
Page 3 of 16
Figure 1: Tank Installation – Safety Equipment
summarized in Table 1 below. Each type is
available with either a standard O-Ring seat or
the optional mechanically tensioned FEP film
seat. The FEP film diaphragm provides a tight
seal capable of meeting current Clean Air Act
fugitive emission levels and is recommended
for cryogenic applications.
Table 1
1660A Series Pilot Operated Valve Models
Model P V Vacuum Operation
1660A X Not Available
1661A X X Direct actuated
1662A X Pilot actuated
A variety of material options are available in
addition to the standard constructions listed in
the Bill of Materials on page 13. Direct
actuated vacuum protection utilizes tank
vacuum applied to the main valve actuator
diaphragm support plate to provide pallet lift.
The non-adjustable vacuum setting varies
according to valve size and materials of
construction, and the valves typically achieve
full flow capacity at 2 Oz/Sq In.
The nameplate shows the basic information
that is listed on each relief valve. See Fig. 2.
Figure 2: Nameplate
Each application must be reviewed to ensure
material compatibility of all metal and soft
goods components with the service
conditions. The pallet assembly and wetted
components are aluminum or 316 SS and
may be upgraded to Hastelloy C or other
alloys for severely corrosive service.
Diaphragms, gaskets and bushings are FEP
film or PTFE. O-Rings can be specified as
Buna-N, EPDM, FFKM or FKM. Sense tubing
is 316SS, and it is available in PVDF for
severely corrosive service.
The pilot valve is set at the factory to comply
with the specification on the purchase order.
The range of adjustment will depend on the
spring installed and will be stamped on the
pilot nameplate. The pressure setting may be
changed within the design range either while
on line or in a service shop. Observe the
proper setting and testing procedure in the
appropriate pilot valve manual.
This manual is intended to provide
recommended procedures and practices for
installation, operation, and maintenance of the
Groth Series 1660A Pilot Operated Valve
(POV). Any standard procedures and
practices developed for a specific plant or
process may supersede this manual.
Although this manual cannot cover all possible
contingencies, following these guidelines
should provide safe, reliable pilot valve
performance.
Note: This manual covers the operation and
maintenance of the pressure/vacuum relief
valve; refer to the appropriate manual for the
pilot valve instructions.
For information not contained in this manual,
please contact:
Groth Corporation
13650 N. Promenade Blvd
Stafford, Texas 77477
281-295-6800 (phone)
281-295-6995 (fax)
www.grothcorp.com
SAFETY WARNINGS
This section is an overview of safety
guidelines that should be followed during the
installation, operation, and maintenance of
your valve. To understand the context of
these instructions and warnings, read and
understand this complete manual.
The purpose of a POV is to prevent excessive
pressure in a tank or process system. The
valve must be designed for the proper MAWP
and flow requirements of the system. Consult
API Standard 2000 for tank protection sizing
procedures. An improperly specified or
functioning relief valve may result in structural
damage to the tank or system.
In the event of an actuator diaphragm failure,
the valve will vent pressure to the
atmosphere, causing the pressure relief valve
to fail in the OPEN position. The valve will
function like a weight loaded valve under this
condition with a lower set point, and will
normally provide rated flow capacity. Consult
factory for any questions related to this overpressure condition.
Page 4 of 16
POV relief pressure and blowdown are set at
the factory per purchase order specifications.
The set pressure and range of adjustment are
stamped on the pilot valve nameplate. Do not
attempt to readjust the set pressure beyond
the limit specified on the nameplate.
The pilot sense line is either 3/8" OD SS
tubing, or 1/2" NPT PVDF pipe. It must be
open and unobstructed to ensure that the pilot
"senses" actual tank pressure. For
applications where tank vapors may condense
or "solidify" in the sense tube or pilot valve, a
nitrogen purge may be required to prevent
internal obstruction. Consult the factory for
recommendations.
DO NOT attempt to remove the pilot valve
from the main valve without removing or
isolating the relief valve from the system.
ALTERNATIVE MEANS OF PRESSURE
RELIEF MUST BE PROVIDED WHEN THE
VALVE IS OUT OF SERVICE. After isolating
the relief valve, bleed all pressure from both
main and pilot valve before removing the
valve. Consult the pilot valve manual before
attempting to repair it. Both the pilot valve
and POV are exposed to process vapors.
Observe all plant procedures and Material
Safety Data Sheet recommendations for the
products in the system when inspecting,
adjusting or servicing the valves. Vents on
the body and spring bonnet of the pilot valve
must be clean and unobstructed for proper
and safe operation of the valve. These vents
should be inspected periodically, and cleaned
or replaced, if necessary.
INSPECTION AND STORAGE
The POV is packed and supported to prevent
damage or contamination during shipping. It
should be similarly protected during
subsequent handling and storage. Always
keep all ports plugged to prevent intrusion of
foreign materials. Before installation inspect
the unit visually. If there are indications of
physical damage or internal contamination,
the valve must be disassembled, cleaned and
inspected before installation. The spring
adjustment cap and blow down screw lock nut
may be "car sealed" to ensure that the factory
pressure setting has not been altered.
Inspect the valve for any sign of damage that
may have occurred in shipment and report this
to the carrier.
Lifting eyes are provided on the upper
A
actuator for handling the valve. To avoid
damage to the lower flange surface, set the
valve on a soft clean gasket material until it is
ready to be installed. It should be stored in a
clean environment until it is mounted on the
tank. The pilot pickup fitting is in the body and
must be kept completely free of all foreign
materials.
INSTALLATION
Handle the 1660A POV carefully to ensure
seat tightness & proper operation.
WARNING: The valve must be installed in
a vertical position as shown in Fig 1. Any
nozzle, piping, or fittings between the relief
valve and the protected equipment must
be such that the pressure drop will not
reduce the relieving capacity below that
required or adversely affect the proper
operation of the relief valve. A nozzle as
shown in Fig 3 will not significantly impact
the flow capacity or operation of the relief
valve.
Figure 3: Suggested Tank Nozzle Design
1. At installation, the valve should be
smoothly lifted into position using the
lifting eyes on the actuator. Use the
actuator housing or outlet flange to align
the valve directly over the flange. Do
NOT use the pilot valve or sense line to
pull the valve into position.
2. Aluminum valve bodies should be
connected with flat-faced 150# ANSI
flanges with a full-faced gasket. Mating
Page 5 of 16
flanges should be flat within .020" and
clean, free of scratches, corrosion and
tool marks.
3. Each valve i s leak tested at the factory as
part of our standard inspection
procedures.
4. Inspect the gasket; make sure that the
material is suitable for the service.
Gasket dimensions are listed in Table 2.
Full gaskets must be used with flat face
flanges. Either full or ring gaskets may be
used with raised face flanges.
Table 2
Inlet/Outlet Flange Gasket Dimensions
NSI
150# I.D.
2” 2.38” 4.12” 6.00” 4.75” 0.75” 4
3” 3.50” 5.38” 7.50” 6.00” 0.75” 4
4” 4.50” 6.88” 9.00” 7.50” 0.75” 8
6” 6.62” 8.75” 11.00” 9.50” 0.88” 8
8” 8.62” 11.00” 13.50” 11.75” 0.88” 8
10” 10.80” 13.38” 16.00” 14.25” 1.00” 12
12” 12.80” 16.12” 19.00” 17.00” 1.00” 12
16” 16.00” 20.25” 23.50” 21.25” 1.12” 16
Ring
O.D.
Full Face Gasket
O.D. B.C. Holes Qty
5. Lubricate all studs and nuts with an
appropriate thread lubricant. If stainless
steel fasteners are used, use an antiseize lubricant such as moly-disulfide.
6. Studs are installed in the valve body at
the factory. Center the gasket within the
bolt circle of the tank nozzle flange.
7. Set the valve carefully on the nozzle.
Make sure the flow path is not restricted
by valve or gasket mis-alignment.
8. Install nuts and lock washers and torque
all fasteners to half the value listed in
Table 3 or 4 in a staggered, alternating
pattern.
9. Make sure that the flanges are not
distorted and that the gasket is evenly
compressed.
10. Make up the final torque and check that
no further nut rotation occurs at the
specified torque value.
11. Normally, the pilot sense line is integral to
the valve assembly. However, if the
optional remote sense connection is
specified, an external sense line must be
installed. See the appropriate options
manual or attached tag for
recommendations.
Page 6 of 16
A
Table 3
Bolt Torque - Flat Face Flange
ANSI
150#
Drilling
2” 4 5/8”-11 81 (11)
3” 4 5/8”-11 106 (15)
4” 8 5/8”-11 68 (9.4)
6” 8 3/4"-10 101 (14)
8” 8 3/4"-10 142 (20)
10” 12 7/8”-9 138 (19)
12” 12 7/8”-9 179 (25)
Torque values are based on 30 PSI pressure and
gasket factors: m = 3.5 & y = 4000
Number
of
Bolts
Stud
Size
UNC
Torque
Ft. Lb.
(Kg. m)
Bolt Torque - Raised Face Flange
NSI
150#
Drilling
2” 4 5/8”-11 31 (4.3)
3” 4 5/8”-11 43 (6.0)
4” 8 5/8”-11 29 (4.0)
6” 8 3/4"-10 51 (7.1)
8” 8 3/4"-10 78 (11)
10” 12 7/8”-9 75 (10)
12” 12 7/8”-9 93 (13)
Number
Bolts
Table 4
of
TROUBLESHOOTING GUIDE
PROBLEM INSPECTION SUGGESTED CORRECTIVE ACTION
Pilot Valve
Leak
Main Valve
Actuator Leak
Visual, audible or
vapor detector
Visual, audible or
vapor detector
Consult troubleshooting guide in specific pilot valve manual
Leakage at the actuator flange may be corrected by tightening
the fasteners adjacent to the leak path. If this is not successful,
it will be necessary to install a new gasket. Refer to page 10,
Assembly.
Stud
Size
UNC
Torque
Ft. Lb.
(Kg. m)
Vapor leakage
from the valve
body outlet.
Visual, audible or
vapor detector
Leakage can occur at the valve body seat - FEP film interface;
other leak paths are the swivel seal or a torn actuator
diaphragm. After removing the upper actuator housing, lift the
pallet assembly off the seat and inspect for damage to the film
or foreign debris buildup on the seat or film. Clean or replace
diaphragm as required. Refer to page 9, Film Seat Pallet.
Vapor leakage
between the
valve body and
tank nozzle
Visual, audible or
vapor detector
Leakage between the flanges may be corrected by tightening
the fasteners. Follow instructions listed on page 5, Installation.
The gasket may have deteriorated due to the chemical
environment; replace if required. The tank nozzle may be
warped, corroded or scratched. This will require resurfacing of
the flange face; note that a flat-faced flange is recommended to
avoid potential damage to an aluminum valve body.
MAINTENANCE
The 1660A POV does not require routine
lubrication or adjustments. It should be
checked periodically, at least twice a year, to
confirm that the valve is functioning properly
and that the set point is correct. Test
connections can be provided to facilitate
testing the valve in the field.
The pilot valve is designed to function in a failsafe manner. The failure of a seal or
diaphragm will cause pressure to be vented to
the atmosphere; the resulting loss in pressure
will cause the main valve to open under rising
pressure.
Periodic inspection for seat tightness is
recommended to ensure compliance with local
air pollution control requirements. If the valve
relieves to the atmosphere, this may be
accomplished with a gas detector calibrated
for the principle product in the system.
The valve will need to be periodically removed
from the tank for inspection of diaphragms,
gaskets and seals. When this is done, the
valve must be carefully lifted using the lifting
eyes on the actuator housing. Refer to
handling instructions listed in the Installation
section of this manual.
If a vapor leak is detected, it will likely be from
one of the following sources:
1. Pilot valve
2. Main valve actuator
3. Main valve diaphragm
4. Body - nozzle flange joint gasket
Refer to the troubleshooting guide of this
manual or the pilot valve manual for probable
causes for these types of problems.
WARNING
If the valve must be removed from the tank for
any reason, make sure that all pressure has
been released before the flange fasteners are
loosened. Refer to your company procedures
before venting the tank pressure and when
handling toxic or otherwise hazardous
materials. Observe all standard safety
precautions as specified on Material Safety
Data Sheets for the product(s) in the system
while removing the valve and when repairing
it.
The main and pilot valve actuator housings,
valve bodies, pallet assemblies and other
components are exposed to the process
vapor.
TOOLS
Most service, adjustment and assembly of the
1660A valve can be performed with the
following common tools:
7/16” - 11/16" open end wrenches
1/4” - 9/16” socket wrenches
Adjustable Wrench
1/16“, 3/32” & 3/16” Allen wrenches
DISASSEMBLY
Note that throughout this manual, numbers
shown in [ ] after the part descriptions refer to
the item numbers in the drawings (Figures 3-
12) and bill of materials, Table 7. Assembly
instructions vary depending on the pallet/seat
configuration and valve size. Exploded views
of the pallet/seat assemblies are included for
clarity.
Observe plant safety procedures in removing
and cleaning the valve before it is sent to a
shop for maintenance. Refer to the SAFETY
WARNINGS listed on page 4 of this manual.
The valve should be handled by the lifting
eyes which are attached to the main valve
actuator housing. It should be supported on
blocks to provide clearance for the outlet
flange during all repair operations.
The external tubing that connects the pilot
valve to the pressure pickup should be
Page 7 of 16
removed first. Loosen the union connection at
the pressure pickup and the tubing fitting at
the pilot body. It is not necessary to remove
the pickup fitting from the body.
Remove the pilot valve [51] from the upper
actuator housing [2] by disconnecting at the
threaded pipe nipple [1]. Inspect and service
the pilot according to the appropriate Groth
manual for either the 1401 or 1402 series
pilots.
Unscrew the hex nuts [6] and lift the upper
actuator housing [2] and gasket [20] carefully
from the valve body. There are two types of
actuator diaphragm support assemblies. The
Model 1660A has one support plate, which is
not attached to the diaphragm. All other
models have the diaphragm sandwiched
between two support plates. Otherwise the
actuator construction is the same for all
models.
If the actuator diaphragm [15] is not attached
to the support plate [4], remove it at this time.
Otherwise, leave it in place and continue.
Lift the lower actuator housing [14], including
the spindle and pallet assembly, from the
body. Remove the second gasket [20].
Check the movement of the pallet assembly
by sliding it until it stops against the spindle
guide [11]. It should move freely with no sign
of binding that may be caused by foreign
materials between the spindle [12] and spindle
guide [11].
Hold the diaphragm support plate [4] while
unscrewing the swivel ball [24] from the
spindle rod [13]. See the following sections
for disassembly and assembly of the specific
pallet types. Remove the spindle [12] from
the guide [11] and inspect the Fluoropolymer
bushing(s) [10] and/or O-Ring seal [67]. The
split bushings are easily removed by prying
from the groove with a sharp probe. Inspect
the spindle surface for scratches or foreign
material.
If the diaphragm is retained between two
support plates, remove the jam nut [47], flat
washer [49], upper (vacuum) support plate
[4.1], and FEP washer [50]. Inspect the
diaphragm carefully to see if there are any
tears, pinholes or signs of chemical
degradation. Remove the lower (pressure)
support plate [4] and O-Ring [48]. All soft
goods should be replaced; refer to Table 5 for
the list of recommended spare parts.
REPLACEMENT PARTS
Table 5. Spare parts kits
2” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG02TB KS1660SG02BB
EPDM KS1660SG02TE KS1660SG02EE
FFKM KS1660SG02TK KS1660SG02KK
FKM KS1660SG02TV KS1660SG02VV
3” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG03TB KS1660SG03BB
EPDM KS1660SG03TE KS1660SG03EE
FFKM KS1660SG03TK KS1660SG03KK
FKM KS1660SG03TV KS1660SG03VV
4” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG04TB KS1660SG04BB
EPDM KS1660SG04TE KS1660SG04EE
FFKM KS1660SG04TK KS1660SG04KK
FKM KS1660SG04TV KS1660SG04VV
6” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG06TB KS1660SG06BB
EPDM KS1660SG06TE KS1660SG06EE
FFKM KS1660SG06TK KS1660SG06KK
FKM KS1660SG06TV KS1660SG06VV
8” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG08TB KS1660SG08BB
EPDM KS1660SG08TE KS1660SG08EE
FFKM KS1660SG08TK KS1660SG08KK
FKM KS1660SG08TV KS1660SG08VV
10” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG10TB KS1660SG10BB
EPDM KS1660SG10TE KS1660SG10EE
FFKM KS1660SG10TK KS1660SG10KK
FKM KS1660SG10TV KS1660SG10VV
12” Model 1660A& 1661A
Soft Goods/Type Film O-Ring
Buna-N KS1660SG12TB KS1660SG12BB
EPDM KS1660SG12TE KS1660SG12EE
FFKM KS1660SG12TK KS1660SG12KK
FKM KS1660SG12TV KS1660SG12VV
Pilot Valve for Model 1660A& 1661A
Soft Goods/Type 1401E 1402A
Buna-N KS1401SGBP KS1402SGBP
EPDM KS1401SGEP KS1402SGEP
FFKM KS1401SGKP KS1402SGKP
FKM KS1401SGVP KS1402SGVP
Page 8 of 16
2” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG02TB KS1662SG02BB
EPDM KS1662SG02TE KS1662SG02EE
FFKM KS1662SG02TK KS1662SG02KK
FKM KS1662SG02TV KS1662SG02VV
3” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG03TB KS1662SG03BB
EPDM KS1662SG03TE KS1662SG03EE
FFKM KS1662SG03TK KS1662SG03KK
FKM KS1662SG03TV KS1662SG03VV
4” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG04TB KS1662SG04BB
EPDM KS1662SG04TE KS1662SG04EE
FFKM KS1662SG04TK KS1662SG04KK
FKM KS1662SG04TV KS1662SG04VV
6” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG06TB KS1662SG06BB
EPDM KS1662SG06TE KS1662SG06EE
FFKM KS1662SG06TK KS1662SG06KK
FKM KS1662SG06TV KS1662SG06VV
8” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG08TB KS1662SG08BB
EPDM KS1662SG08TE KS1662SG08EE
FFKM KS1662SG08TK KS1662SG08KK
FKM KS1662SG08TV KS1662SG08VV
10” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG10TB KS1662SG10BB
EPDM KS1662SG10TE KS1662SG10EE
FFKM KS1662SG10TK KS1662SG10KK
FKM KS1662SG10TV KS1662SG10VV
12” Model 1662A
Soft Goods/Type Film O-Ring
Buna-N KS1662SG12TB KS1662SG12BB
EPDM KS1662SG12TE KS1662SG12EE
FFKM KS1662SG12TK KS1662SG12KK
FKM KS1662SG12TV KS1662SG12VV
Pilot Valve for Model 1662A
Soft Goods/Type 1401EV
Buna-N KS1401SGBV
EPDM KS1401SGEV
FFKM KS1401SGKV
FKM KS1401SGVV
FILM SEAT PALLET
Turn the pallet assembly upside down to
disassemble. If placing in a vise, clamp
against the flats on the swivel ball [24]. Do
not clamp on the socket or it will be deformed
and restrict seat alignment. Loosen the jam
nut [34] and turn the jackscrew [33]
counterclockwise to release tension on the
FEP film [40]. Use an allen wrench to hold the
countersunk screws [42] and loosen the hex
nuts [43] that retain the ring [41]. Remove all
components from the jackscrew assembly
(see Figure 4) and replace the film. Remove
the retaining ring [28] and replace the O-Ring
[29].
Page 9 of 16
Screw the jam nut [34] completely onto to the
jackscrew [33] and thread the jack screw into
the jackscrew bushing [35] until the tip
extends slightly through the opposite end (hex
side).
To assemble, install the O-Ring [29] in the
pallet counterbore and insert the swivel socket
[26]. Replace the retaining ring [28]. Do not
expand the retaining ring excessively.
Table 6
FEP Seat Film Dimensions
SIZE O.D. HOLE DIA.
2” 4.50” 0.38”
3” 5.50” 0.38”
4” 6.50” 0.38”
6” 8.50” 0.44”
8” 10.63” 0.44”
10” 12.63” 0.62”
12” 14.63” 0.62”
The FEP film [40] is provided at least 3/4”
larger than the outside diameter of the film
seat ring [41]. This excess material is
required for handling at assembly. Place the
film on a clean flat surface and punch a hole
in the center (see Table 6) to provide
clearance for the jackscrew bushing [35].
Install the jackscrew bushing [35] through the
film tension plate [39]; as shown in Figure 4.
Lay the film [40] over the plate [39], then the
fluoropolymer washer [46]; flat washer [38];
belleville washer [37]; and tighten the jam nut
[36] while holding the jackscrew bushing with
a wrench. Tighten until the belleville washer
is flat; do not over-tighten as the FEP film can
be damaged or cut at the washer O.D. Use
care in handling the film at all stages of
assembly.
Figure 4: Film Pallet Assembly
Position the film sub-assembly on the face of
the pallet with the tip of the jackscrew [33] in
the counterbore of the swivel socket [26].
Hold the film so it is taut and wrinkle free.
Align the bolt holes of the seat ring [41] and
pallet [45] and press the parts firmly together,
clamping the film securely.
Punch four holes at 90 apart through the film
and insert the socket head screws [42]
through the ring and plate. Install the lock
washers [44] and hex nuts [43] and tighten
using an allen wrench to hold the screws.
Complete the assembly by punching the
remaining holes and install the screws, lock
washers and hex nuts.
After all fasteners are tightened, turn the
jackscrew [33] clockwise to tighten the film
until the slope is approximately 15. Do not
over-tighten, as it is possible to bend the
tension plate [39] or tear the film. Tighten the
jam nut [34] to lock the jackscrew. Using a
sharp knife, trim the excess film at the O.D. of
the ring [41].
Carefully set the film seat pallet assembly
onto the valve body seat. Check the gap
between the bottom of the film seat ring [41]
and the top surface of the body seat; it should
be between 1/32” and 1/16”. If there is
insufficient clearance, the film should be
retensioned. Carefully lift the assembly out of
the valve and loosen the jam nut [34] on the
jackscrew two or three turns. Rotate
jackscrew clockwise as required to tension
film and then retighten the jam nut [34].
Lower the pallet assembly into the valve and
recheck the film seat gap. Remove this subassembly and store on a clean surface.
O-RING SEAT PALLET
Remove the retaining ring [28], the retainer
plate [30] and two O-Rings [29 & 31]. Inspect
and clean the O-Ring groove and the bore in
the pallet. Install new O-Rings, and replace
the retainer plate [30] and retaining ring [28].
Do not expand the retaining ring
excessively.
Figure 5: O-Ring Pallet Assembly
BODY SEAT INSERT
The seating surface is a thin stainless steel
insert [27] bonded into the body. The flat top
surface contacts the O-Ring in the standard
pallet assembly. The corner radius contacts
the tensioned film of the optional pallet
assembly.
Page 10 of 16
Figure 6: Spindle Assembly-Model 1660A
Models 1661A+1662A: The actuator
diaphragm is mounted between the upper
(vacuum) [4.1] support plate and the lower
(pressure) [4] support plate. Thread the
spindle rod [13] through the upper spindle cap
[22].
Temporarily seat the spindle tube against the
cap and adjust the rod until it extends 3/16”
beyond the lower end of the tube. Remove
the tube and install the O-Ring [48], pressure
support plate [4], diaphragm [15],
Fluoropolymer washer [50], vacuum support
plate [4.1], and flat washer [49]. Install the
jam nut [47] and tighten securely.
Inspect the appropriate surface to be sure it is
clean, smooth and flat. Press and twist the
insert manually to verify that it firmly bonded
into the body.
If the O-Ring pallet is used, the flat sealing
surface of the insert may be lapped, using a
flat lapping block.
If the film pallet is used, the sealing radius
may be hand polished, very carefully. The
radius must be uniform and not exceeding
.030”.
ASSEMBLY
Model 1660A: This model has one support
plate riveted [3] to the spindle cap. Screw the
jam nut [47] onto the spindle rod [13] and
screw the rod into the spindle cap [22] until it
is flush with the top surface of the support
plate [4]. Then tighten the jam nut securely.
Figure 7: Spindle Assembly-Model 1661A-62
Replace the bushing(s) [10] and/or O-Ring
seal [67] in the spindle guide sub-assembly.
Insert the spindle tube and make sure that it
moves freely. Insert the spindle rod subassembly into the tube and seat the tube
against the upper cap. Install the lower
spindle cap [25] and screw the rod into the
swivel ball on the pallet sub-assembly. Hold
the support plate [4] and tighten the swivel ball
[24] securely.
Place a gasket [20] on the actuator mounting
surface of the valve body. Turn the lower
actuator housing [14] with spindle and pallet
assembly upright. Place two temporary blocks
between the housing and the diaphragm
support plate [4]. This will hold the pallet
suspended above the body seat when it is
lowered into the body. On small valve sizes,
the spindle/seat assembly can be supported
manually.
Carefully lower the assembly into the body.
Raise the diaphragm support plate manually
and remove the wood blocks. Lower the
diaphragm support plate gently, while aligning
the diaphragm hole pattern with the body
studs, until the pallet assembly is seated in
the valve body. Install the diaphragm [15]
onto the studs.
Note: If the Model 1402A pilot is used, a
spacer gasket [58] is installed between the
lower actuator housing [14] and the
diaphragm [15]. The pilot will be connected to
a hole on the actuator mounting surface of the
valve body. In this case, the odd hole in the
body gasket [20], lower actuator housing [14]
and spacer gasket [58] must align with the
body hole.
Page 11 of 16
WARNING
Failure to properly align gaskets and the
lower housing on valves equipped with the
Model 1402A pilot will prevent the valve
from opening.
20
2
15
58
20
14
Figure 8: 1402A Pilot Connection
Note: If the diaphragm is not attached to the
support plate, install the diaphragm after the
pallet assembly is in place. Lay it on top of
the support plate and align the holes with the
studs.
Install the second gasket [20], upper actuator
housing [2], lock washers [8] and hex nuts [6],
and tighten evenly in a criss-cross pattern.
Wrap the threads of the pipe nipple [1] with
Fluoropolymer tape and thread it into the
coupling in the upper actuator housing [2].
Install the pilot valve [51] and reconnect the
tubing between the body pickup fitting and the
pilot inlet port.
DRAWINGS AND BILL OF MATERIALS
Page 12 of 16
Figure 9: Model 1661A with 1401E Pilot
Pilot Operated Pressure Relief – Direct Acting Vacuum Relief
Page 13 of 16
Table 7: Bill of Materials
ITEM DESCRIPTION Material
Alum CS SS
1 Nipple, Pipe, 1/2" NPT 316
2 Housing, Upper Actuator Alum CS 316
3 Rivet, Plate 316
4 Plate, Support, Pressure Alum 316 316
4.1 Plate, Support, Vacuum Alum 316 316
5 Stud 316
6 Nut, Hex 316
7 Washer, Flat 316
8 Washer, Lock 316
9 Plug, Pipe 316
10 Bearing, Spindle Fluoropolymer
11 Guide, Spindle 316
12 Spindle Alum 316 316
13 Rod, Spindle 316
14 Housing, Lower Actuator Alum CS 316
15 Diaphragm, Actuator FEP
16 Stud 304
17 Nut, Hex 304
18 Fitting, Pick-Up 316
19 Body Alum CS 316
20 Gasket, Actuator FEP
21 Nut, Hex Jam, 316
22 Cap, Spindle Upper Alum 316 316
23 Washer, Bearing 316
24 Swivel, Ball 316
25 Cap, Spindle Lower Alum 316 316
26 Swivel, Socket 316
27 Seat Ring 316
28 Snap Ring SS
29 O-Ring Elastomer
30 Retainer, O-Ring 316
31 O-Ring Elastomer
32 Pallet, O-Ring Alum 316 316
33 Jack Screw 316
34 Nut, Hex Jam, 316
35 Bushing, Jack Screw Alum 316 316
36 Nut, Hex Jam, 316
37 Belleville Washer SS
38 Washer, Flat 316
39 Plate, Film Tension Alum 316 316
40 Film FEP
41 Ring, Film Retaining Alum 316 316
42 Screw, FH Hex Socket SS
43 Nut, Hex SS Figure 5: O-Ring Pallet Assembly
44 Washer, Lock SS
45 Pallet, Film Alum 316 316
Spare
Parts
Figure 4: Film Pallet
Assembly
ITEM DESCRIPTION Material
Alum CS SS
46 Washer FEP
47 Hex Jam Nut 316
48 O-Ring Fluoropolymer
49 Washer, Flat 316
50 Washer FEP
51 Pilot, Model 1401E SS SS 316
52 Male Connector 316
53 Male Connector 316
54 Tubing, 3/8 OD (Sense Line) 316
55 Tee, 3/8 Tubing 316
56 Check Valve, Model 1900 Alum 316 316
57 Male Connector 316
58 Gasket, Spacer Non Asbestos Fiber
59 Vent Alum
60 Cross, ½ NPT[F] 316
61 Plug, ½” Pipe 316
62 Pilot, Model 1401EV SS SS 316
63 Pilot, Model 1402A SS SS 316
64 Cross, 3/8 Tubing 316
65 Nipple, ½ NPT 316 Figure 10: Jackscrew Assembly
66 Elbow, Street, ½” 316
67 O-Ring Elastomer
68 Nipple, ¼ NPT 316
76 Lifting Eye SS
() Recommended spare parts, included in s oft goods kits. Elastomer is
Buna-N, EPR, FKM, FFKM or other as specified by the purchaser.
Spare
Parts
Note: Some components are not
used on all models; refer to assembly
and sub-assembly drawings
63
Page 14 of 16
52
54
57
67
Figure 11: Model 1661A with 1402A Pilot
Pilot Operated Pressure Relief – Direct Acting Vacuum Relief
Page 15 of 16
53
62
54
55
Page 16 of 16
MODEL NUMBER
The nameplate on the Groth Series 1660A Pilot Operated Valve contains the model number, serial
number, set pressure and flow capacity. The model number contains additional information about
materials of construction and options. The following chart will assist in relating the model number to the
specifications of your pilot operated valve:
PRODUCT LIMITED WARRANTY
A. Seller warrants that products which are manufactured
by Seller, are manufactured in accordance with
published specifications and free from defects in
materials and/or workmanship for a period of (12)
twelve months. Seller, at its option, will repair or
replace any products returned intact to the factory,
transportation charges prepaid, which Seller, upon
inspection, shall determine to be defective in material
and/or workmanship. The foregoing shall constitute
the sole remedy for any breach of Seller's warranty.
B. THERE ARE NO UNDERSTANDINGS,
AGREEMENTS, REPRESENTATIONS, OR
WARRANTIES, EXPRESS OR IMPLIED, (INCLUDING
MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE REGARDING PRODUCTS)
UNLESS SPECIFIED IN THE SALES CONTRACT.
THIS CONTRACT STATES THE ENTIRE
OBLIGATION OF SELLER.
Seller makes no warranties, either express or implied,
except as provided herein, including without limitation
thereof, warranties as to marketability, merchantability,
for a particular purpose or use, or against infringement of
any patent of products. In no event shall Seller be liable
for any direct, incidental or consequential damages of
any nature, or losses or expenses resulting from any
defective new product or the use of any such product,
including any damages for loss of time, inconvenie nce,
or loss of use of any such product.
C. The original Manufacturer shall be solely responsible for
the design, development, supply, production, and
performance of its products hereunder, and the
protection of its trade name or names, if any. It assumes
no responsibility, for products modified or changed in
any way by its agent or customer. Any such
modifications or changes to products sold by Seller
hereunder shall make the product limited warranty null
and void.
D. The Manufacturer shall be under no obligation to
manufacture, sell, or supply, or to continue to
manufacture, sell or supply any of the Products
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