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D102175X012
Design EZ-C, ET-C, and EWT-C Cryogenic
Sliding-Stem Control Valves
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . .
Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packing Maintenance 5. . . . . . . . . . . . . . . . . . . . .
Replacing Packing 6. . . . . . . . . . . . . . . . . . . . . . .
Trim Maintenance 8. . . . . . . . . . . . . . . . . . . . . . . .
Design EZ-C Trim Disassembly 8. . . . . . . . . . .
Design EZ-C Trim Assembly 9. . . . . . . . . . . . . .
Design ET-C and EWT-C Trim Disassembly 10
Design ET-C and EWT-C Valve Plug
Maintenance 11. . . . . . . . . . . . . . . . . . . . . . . . .
Design ET-C and EWT-C Trim Assembly 11. .
Coining Soft Metal-to-Metal Seats 11. . . . . . . .
Parts Ordering 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bonnet Parts 16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Design EZ-C Valve Body Parts 17. . . . . . . . . . . .
Design ET-C and EWT-C Valve Body Parts 21.
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts information for Design EZ-C,
ET-C and EWT-C valves (see figure 1). Refer to
separate manuals for instructions covering the
actuator and accessories.
No person may install, operate, or maintain Design
EZ-C, ET-C and EWT-C valves without first D being
fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance,
and D carefully reading and understanding the
contents of this manual. If you have any questions
about these instructions, contact your Emerson
Process Managementt sales office before
proceeding.
Figure 1. Typical Cryogenic Valve with Extension
Bonnet and 585C Series Actuator
W6370/IL
Note
Neither Emersonr, Emerson Process
Management, Fisherr, nor any of their
affiliated entities assumes
responsibility for the selection, use
and maintenance of any product.
Responsibility for the selection, use,
and maintenance of any product
remains with the purchaser and
end-user.
Description
Design EZ-C: globe-style, single-port, unbalanced
valves with integral end connections, post guiding,
metal-to-metal seating, and quick-change trim. They
feature stainless steel construction materials and
fabricated extension bonnets.
Designs ET-C and EWT-C: metal-to-metal seated
globe-style, single-port, cage-guided,
pressure-balanced valves featuring stainless steel
construction materials and fabricated extension
bonnets.
Instruction Manual
Form 5376
August 2006
EZ-C, ET-C, and EWT-C Valves
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
2
Table 1. Specifications
Valve Sizes
Design EZ-C: J 1-, J 1.5, J 2-, J 3-, and
J 4-inch
Design ET-C: J 3-, J 4-, J 6-, and J 8-inch
Design EWT-C: J 6X4
(1)
-, J 8X4-, J 8X6-,
J 12X6-, and J 10X8-inch
End Connection Styles
(2)
Class 150, 300, and 600 raised-face flanges per
ASME B16.5
Maximum Inlet Pressure
(2)
Class 150 and 300—Valves are consistent with
pressure-temperature ratings per ASME B16.34
Class 600—Valves with B8M Class 2 bolting are
consistent with Class 600 pressure-temperature
ratings per ASME B16.34 except as shown below:
DESIGN EZ-C VALVES
Valve Size,
Inches
Maximum Inlet Pressure
Bar Psig
1
2
3
77
83
94
1110
1200
1370
DESIGNS ET-C AND EWT-C VALVES
Valve Size,
Inches
Maximum Inlet Pressure
Bar Psig
3 94 1370
6, 8 x 6, 12 x 6 75 1085
8, 10 x 8 96 1390
Class 600—Valves with optional S20910 (XM-19)
bolting are consistent with Class 600
pressure-temperature ratings per ASME B16.34
Shutoff Classifications per ANSI/FCI 70-2
and IEC 60534-4
VALVE DESIGN SHUTOFF CLASS
EZ-C
Class IV—Standard
Class VI—Optional
ET-C and EWT-C
Class IV—Standard
Standard Air Test
(3)
—Optional
Material Temperature Capability
(2)
Design EZ-C: −198 to 149_C (−325 to 300_F)
Designs ET-C and EWT-C:
−198 to 66_C (−325 to 150_F)
Maximum Allowable Actuator Thrust
See table 2
Flow Characteristics
Design EZ-C: Equal percentage, linear, and
quick opening
Designs ET-C and EWT-C: Equal percentage
and linear
Flow Directions
Design EZ-C:Up through the seat ring only
Designs ET-C and EWT-C
:
Normally down
(4)
Approximate Weights
Design EZ-C:
1-Inch Size: 11 kg (33 lb)
1.5 Inch Size: 23 kg (48 lb)
2-Inch Size: 41 kg (90 lb)
3-Inch Size: 60 kg (130 lb)
4-Inch Size: 95 kg (210 lb)
Design ET-C:
3-Inch Size: 51 kg (135 lb)
4-Inch Size: 95 kg (210 lb)
6-Inch Size: 211 kg (465 lb)
8-Inch Size: 372 kg (820 lb)
Design EWT-C
6X4-Inch Size: 200 kg (440 lb)
8X4-Inch Size: 277 kg (610 lb)
8X6-Inch Size: 318 kg (700 lb)
12X6-Inch Size: 730 kg (1610 lb)
10X8-Inch Size: 753 kg (1660 lb)
1. Valve size number is end connection size by normal trim size. For example, a 6X4 valve has 6-inch end connections with 4-inch trim.
2. Do not exceed the pressure/temperature limits in this manual and any applicable code limitation.
3. Maximum leakage is 0.05 mL/min/psid/inch port diameter.
4. Down is in through the cage and out the seal ring. (see figure 9).
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
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Table 2. Maximum Allowable Actuator Thrust for Standard Style 3 Bonnet Extension Length
VALVE SIZE, INCHES
STEM DIAMETER
MAXIMUM ALLOWABLE STEM LOAD
FOR S20910 (XM-19) STEM MATERIAL
mm Inches N Lb
1
9.5 3/8 5382 1210
12.7 1/2 13,166 2960
1.5
9.5 3/8 5338 1200
12.7 1/2 13,166 2960
2
12.7 1/2 14,367 3230
19.1 3/4 44,169 9930
3
12.7 1/2 15,301 3440
19.1 3/4 45,459 10,220
4, 6X4, 8X4
12.7 1/2 16,458 3700
19.1 3/4 46,971 10,560
6, 8X6, 12X6
19.1 3/4 36,385 8180
25.4 1 81,487 18,320
8, 10X8
19.1 3/4 41,366 9300
25.4 1 87,003 19,560
Installation
Isolate the control valve from the line pressure,
release pressure from both sides of the valve body,
and drain the process media from both sides of the
valve. Remove actuator supply pressure, and use
lock-out procedures to be sure that the above
measures stay in effect while you work on the
equipment. Refer to the Warnings at the beginning
of the Maintenance section for additional
information.
WARNING
Always wear protective gloves,
clothing, and eyewear when
performing any installation operations
to avoid personal injury.
Personal injury or equipment damage
caused by sudden release of pressure
may result if the valve assembly is
installed where service conditions
could exceed the limits given in table 1
or on the appropriate nameplates. To
avoid such injury or damage, provide a
relief valve for over-pressure
protection as required by government
or accepted industry codes and good
engineering practices.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
If installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.
CAUTION
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Since
some valve body/trim material
combinations are limited in their
pressure drop and temperature
ranges, do not apply any other
conditions to the valve without first
contacting your Emerson Process
Management sales office.
Before installing the valve, inspect the
valve and pipelines for any damage
and any foreign material which may
cause product damage.
1. Before installing the valve, inspect the valve and
associated equipment for any damage and any
foreign material.
2. Make certain the valve body interior is clean, that
pipelines are free of foreign material, and that the
valve is oriented so that pipeline flow is in the same
direction as the arrow on the side of the valve.
3. Gas Service: The normal method of mounting for
gas service is with the actuator vertical above the
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
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valve body. However, the control valve assembly
may be installed in any orientation unless limited by
seismic criteria. Other positions may result in uneven
valve plug and cage wear that could result in
improper operation. For mounting assistance,
consult your Emerson Process Management sales
office.
CAUTION
To avoid possible damage to the
packing, do not allow the installed
actuator angle to be so flat as to allow
liquid inside the bonnet to come in
contact with the packing.
Also, if insulation is applied, do not let
the insulation run up the extension
bonnet. This could cause the packing
to freeze and be damaged.
Liquid Service: The preferred method of mounting
for liquid service is with the actuator vertical above
the valve body. This will allow a vapor layer to form
between the liquid and the packing. If there are
piping constraints, the actuator can be angled
slightly from vertical. However, in no case should the
angle be so flat as to allow liquid inside the bonnet to
come in contact with the packing. For mounting
assistance, consult your Emerson Process
Management sales office.
4. If insulation is applied, make sure it is applied
only to the body/bonnet joint. Do not let the
insulation run up the extension bonnet.
5. Use accepted piping and welding practices when
installing the valve in the line. For flanged valve
bodies, use a suitable gasket between the valve
body and pipeline flanges.
6. If the actuator and valve are shipped separately,
refer to the actuator mounting procedure in the
appropriate actuator instruction manual.
WARNING
Personal injury could result from
packing leakage. Valve packing was
tightened before shipment; however,
the packing might require some
readjustment to meet specific service
conditions.
Valves with ENVIRO-SEAL
R
live-loaded packing will
not require this initial readjustment. See the Fisher
instruction manual titled ENVIRO-SEAL Packing
System for Sliding-Stem Valves for packing
instructions. If you wish to convert your present
packing arrangement to ENVIRO-SEAL packing,
refer to the retrofit kits listed in the parts kit
sub-section near the end of this manual.
Maintenance
Valve parts are subject to normal wear and must be
inspected and replaced as necessary. Inspection
and maintenance frequency depends on the severity
of service conditions. This section includes
instructions for packing maintenance and trim
maintenance. All maintenance operations may be
performed with the valve in the line.
WARNING
Avoid personal injury or property
damage from sudden release of
process pressure. Before performing
any maintenance operations:
D Always wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations to avoid personal injury.
D Disconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the valve.
D Use bypass valves or completely
shut off the process to isolate the
valve from process pressure. Relieve
process pressure from both sides of
the valve. Drain the process media
from both sides of the valve.
D Vent the pneumatic actuator
loading pressure and relieve any
actuator spring precompression.
D Use lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
D The valve packing box may
contain process fluids that are
pressurized, even when the valve has
been removed from the pipeline.
Process fluids may spray out under
pressure when removing the packing
hardware or packing rings, or when
loosening the packing box pipe plug.
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
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Figure 2. Single PTFE V-Ring Packing Arrangement
12A7837-A
A6745/IL
D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
CAUTION
Follow instructions carefully to avoid
damaging the product surfaces, which
could result in damage to the product.
Note
Whenever a gasket seal is disturbed
by removing or shifting parts, a new
gasket should be installed upon
reassembly. This is necessary to
ensure a good gasket seal since the
used gasket may not seal properly.
Packing Maintenance
This section covers PTFE V-ring, double PTFE, and
graphite packing used in extension bonnets
(figures 2, 3, and 4).
Note
If the valve has ENVIRO-SEAL
live-loaded packing installed, refer to
the instruction manual ENVIRO-SEAL
Packing System for Sliding Stem
Valves, Form 5306, for packing
instructions. Figure 6 shows typical
ENVIRO-SEAL arrangements.
Figure 3. Double PTFE V-Ring Packing Arrangements
A6746/IL
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1-1/4 INCH)
STEM
Figure 4. Graphite Ribbon/Filament Packing Arrangements
A6747/IL
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1-1/4 INCH)
STEM
0.102 mm (0.004 INCH)
Standard packing key numbers are shown in figures
2, 3, and 4. ENVIRO-SEAL packing key numbers
are shown in figure 6. Bonnet key number locations
are shown in figure 7, and valve key numbers are
shown in figures 8 and 9.
For spring-loaded single PTFE V-ring packing, the
spring (key 8) maintains a sealing force on the
packing. If leakage is noted around the packing
follower (key 13), check to be sure the shoulder on
the packing follower is touching the bonnet. If the
shoulder is not touching the bonnet, tighten the
packing flange nuts (key 5), until the shoulder is
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
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against the bonnet. If leakage cannot be stopped in
this manner, proceed with replacing packing
procedures.
If there is undesirable packing leakage with other
than spring-loaded packing, first try to limit the
leakage and establish a stem seal by tightening the
packing flange nuts.
If the packing is relatively new and tight on the stem,
and if tightening the packing flange nuts does not
stop the leakage, it is possible that the valve stem is
worn or nicked so that a seal cannot be made. The
surface finish of a new valve stem is critical for
making a good packing seal. If the leakage comes
from the outside diameter of the packing, it is
possible that the leakage is caused by nicks or
scratches around the packing box wall. If performing
any of the following procedures, inspect the valve
stem and packing box wall for nicks and scratches.
Replacing Packing
WARNING
Refer to the WARNING at the
beginning of the Maintenance section
in this instruction manual.
Key numbers and sequence of assembly of packing
parts are shown in figures 2, 3, and 4. Bonnet key
number locations are shown in figure 7, and valve
key number locations are shown in figures 8 and 9,
unless otherwise noted.
1. Isolate the control valve from the line pressure,
release pressure from both sides of the valve body,
and drain the process media from both sides of the
valve. If using a power actuator, also shut off all
pressure lines to the power actuator, and release all
pressure from the actuator. Use lock-out procedures
to be sure that the above measures stay in effect
while you work on the equipment. Observe the
Warnings at the start of the Maintenance section.
2. Disconnect the operating lines from the actuator
and any leak-off piping from the bonnet. Disconnect
the stem connector and remove the actuator from
the valve by unscrewing the yoke locknut (key 15) or
hex nuts (key 26, not shown).
3. Loosen the packing flange nuts (key 5) so that
the packing is not tight on the valve stem. Remove
any travel indicator parts and stem locknuts from the
valve stem threads.
WARNING
D To avoid personal injury or
property damage caused by
uncontrolled movement of the bonnet,
loosen the bonnet by following the
instructions in the next steps.
Do not remove a stuck bonnet by
pulling on it with equipment that can
stretch or store energy in any other
manner. The sudden release of stored
energy can cause uncontrolled
movement of the bonnet.
D To avoid personal injury or
damage to the seating surface caused
by the valve plug and stem assembly
dropping from the bonnet after being
lifted out of the valve body, observe
the following instructions.
4. When lifting a Design EZ-C bonnet, temporarily
install a valve stem locknut on the valve stem. This
locknut will prevent the valve plug and stem
assembly from dropping out of the bonnet.
5. When lifting a Design ET-C or EWT-C bonnet,
be sure the plug and stem assembly and cage
remain in the valve body.
WARNING
To avoid possible personal injury,
review your process shutdown
procedures to be sure process
pressure is not applied to the valve for
the following procedure.
6. Hex nuts (key 16) attach the bonnet to the valve
body (key 1). Loosen these nuts or cap screws
approximately 3 mm (1/8 inch). Then, loosen the
body-to-bonnet joint by either rocking the bonnet or
prying between the bonnet and valve body. Work
with a prying tool around the bonnet until the bonnet
loosens.
D If fluid leaks from the joint, it may indicate that
process pressure is applied to the valve. Review
your process shutdown procedures, and be sure
process pressure is not
applied to the valve.
D If no fluid leaks from the joint, remove the nuts
completely and carefully lift the bonnet off the valve
body.
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
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Table 3. Recommended Torque for Packing Flange Nuts
VALVE STEM DIAMETER
CLASS
GRAPHITE PACKING PTFE PACKING
Minimum Torque Maximum Torque Minimum Torque Maximum Torque
mm Inch
NSm
Lbf-in
NSm
Lbf-in
NSm
Lbf-in
NSm
Lbf-in
9.5 3/8
150 3 27 5 40 1 13 2 19
300 4 36 6 53 2 17 3 26
600 6 49 8 73 3 23 4 35
12.7 1/2
150 5 44 8 66 2 21 4 31
300 7 59 10 88 3 28 5 42
600 9 81 14 122 4 39 7 58
19.1 3/4
150 11 99 17 149 5 47 8 70
300 15 133 23 199 7 64 11 95
600 21 182 31 274 10 87 15 131
25.4 1
150 19 169 29 254 9 80 14 120
300 26 226 38 339 12 108 18 162
600 35 310 53 466 17 149 25 223
31.8 1-1/4
150 27 238 40 357 13 113 19 169
300 36 318 54 477 17 152 26 228
600 49 437 74 655 24 209 36 314
Table 4. Body-to-Bonnet Torque Guidelines
VALVE SIZE, INCHES
BOLT TORQUES
(1)
Bolt Material
B8M
(2)
or
S20910 (XM-19)
(3)
NSm
Lbf-ft
1 122 90
1.5 or 2 91 67
3 163 120
4, 6X4, or 8X4 258 190
6, 8X6, or 12X6 522 385
8 or 10X8 712 525
1. Determined from laboratory testing.
2. SA193-B8M strain hardened.
3. Hot rolled.
7. For Design EZ-C valves, remove the stem
locknut. Separate the valve plug and stem from the
bonnet, and set the parts on a protective surface to
prevent damage to gasket or seating surfaces.
8. For Designs ET-C and EWT-C: If it is necessary
to remove and inspect the valve trim, refer to the
following Trim Maintenance section.
9. Remove the bonnet gasket (key 10) and cover
the opening in the valve to protect the gasket
surface and prevent foreign material from getting
into the valve body cavity.
10. Remove the packing flange nuts, packing
flange, upper wiper, and packing follower
(keys 5, 3, 12, and 13). Carefully push out all the
remaining packing parts from the valve side of the
bonnet using a rounded rod or other tool that will not
scratch the packing box wall. Clean the packing box
and metal packing parts.
11. Inspect the valve stem threads and packing box
surfaces for any sharp edges which might cut the
packing. Scratches or burrs in the packing box
surfaces could cause leakage or damage to the new
packing. If the surface condition cannot be improved
by light sanding, replace the damaged parts.
12. If necessary, go to the Trim Maintenance
procedures to remove, inspect or replace trim parts.
Return to this section when installing the bonnet on
the valve body.
Installing the Bonnet
13. Remove the covering protecting the valve body
cavity and install a new bonnet gasket (key 10),
making sure the gasket seating surfaces are clean
and smooth. Then slide the bonnet over the stem
and onto the stud bolts (key 15).
Note
Proper performance of the bolting
procedures in step 10 compresses the
spiral wound gasket (key 12) or load
ring (key 26) to both load and seal the
seat ring gasket (key 13). It also
compresses the outer edge of the
bonnet gasket (key 10) to seal the
body-to-bonnet joint.
EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
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The proper bolting procedures in step
14 include, but are not limited to,
ensuring that bolting threads are clean
and evenly tightening the cap screws
or nuts onto the studs in a crisscross
pattern. Tightening one cap screw or
nut may loosen an adjacent cap screw
or nut. Repeat the crisscross
tightening pattern several times until
each cap screw or nut is tight and the
body-to-bonnet seal is made.
14. Lubricate the bolting with anti-seize lubricant
and install it, using accepted bolting procedures
during tightening, so that the body-to-bonnet joint will
withstand test pressures and application service
conditions. Use the bolt torques in table 4 as
guidelines.
15. Install new packing and the metal packing box
parts according to the appropriate arrangement in
figures 2, 3, or 4. Place a smooth-edged pipe over
the valve stem and gently tap each soft packing part
into the packing box.
16. Slide the packing follower, upper wiper, and
packing flange (keys 12, 13, and 3) into position.
Lubricate the packing flange studs (key 4) and faces
of the packing flange nuts (key 5). Install the packing
flange nuts.
17. Tightening packing flange nuts (key 5):
a. For spring-loaded PTFE V-ring packing,
tighten the packing flange nuts until the shoulder
on the packing follower (key 13) contacts the
bonnet.
b. For graphite packing, tighten the packing
flange nuts to the maximum
recommended
torque shown in table 3. Then, loosen the
packing flange nuts, and retighten them to the
recommended minimum torque shown in table 3.
c. For double PTFE V-ring packing, tighten the
packing flange nuts alternately in small equal
increments until one of the nuts reaches the
minimum recommended torque shown in table 3.
Then, tighten the remaining nut until the packing
flange is level and at a 90 degree angle to the
valve stem.
d. For ENVIRO-SEAL live-loaded packing,
refer to the Fisher instruction manual titled:
ENVIRO-SEAL Packing System for Sliding-Stem
Valves.
18. Mount the actuator on the valve assembly and
reconnect the actuator and valve stem according to
the procedure in the appropriate actuator instruction
manual.
Trim Maintenance
WARNING
Refer to the WARNING at the
beginning of the Maintenance section
in this instruction manual.
This procedure describes how the valve trim can be
completely disassembled. When inspection or
repairs are required, perform only those steps
necessary to accomplish the task. Observe the
Warning at the start of the Maintenance section.
Key number locations are shown in figures 8 and 9,
unless otherwise noted.
Design EZ-C Trim Disassembly
Key number locations are shown in figure 8, unless
otherwise noted.
1. Remove the actuator and the bonnet according to
steps 1 through 9 of the Replacing Packing
procedures in the Maintenance section.
WARNING
To avoid personal injury due to leaking
fluids, avoid damaging gasket sealing
surfaces.
The surface finish of the valve stem
(key 7) is critical for making a good
packing seal.
The seating surfaces of the valve plug
(key 2) and seat ring (key 9) are critical
for proper shutoff.
Protect these surfaces accordingly.
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