Fisher Instruction Manual: Fisher EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves Manuals & Guides
Instruction Manual
D100392X012
EH Valves NPS 8 through 14
Fisher™ EHD and EHT NPS 8 through 14
Sliding‐Stem Control Valves
June 2017
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Specifications 2...............................
Educational Services 3.........................
Installation 3..................................
Principle of Operation 5.........................
Maintenance 5.................................
Packing Lubrication 6..........................
Packing Maintenance 7.........................
Replacing Packing 7........................
Trim Removal 12..............................
EHD, EHT Valve Plug Maintenance 12.............
Lapping Seats 13..............................
Trim Replacement 14..........................
Retrofit: Installing Bore Seal Trim 17..............
Replacement of Installed Bore Seal Trim 19........
Trim Removal (Bore Seal Constructions) 19....
Lapping Metal Seats
(Bore Seal Constructions) 20..............
Remachining Metal Seats
(Bore Seal Constructions) 20..............
Trim Replacement
(Bore Seal Constructions) 20..............
Actuator Mounting 22.........................
Parts Ordering 22...............................
Parts Kits 23...................................
Parts List 25...................................
Bonnet Assembly 25...........................
Valve Assembly 26............................
Figure 1. Fisher EH Series Control Valve
with 667 Actuator
W2992‐1
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts ordering information for NPS 8 through 14 Fisher
EHD and EHT sliding‐stem globe‐style control valves. Refer to separate manuals for instructions covering the actuator,
positioner, and accessories.
Do not install, operate, or maintain an EH valve without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson sales office
proceeding.
www.Fisher.com
or Local Business Partner before
EH Valves NPS 8 through 14
June 2017
Table 1. Specifications
Instruction Manual
D100392X012
End Connection Styles
Buttwelding: All available ASME B16.25 schedules
that are compatible with ASME B16.34
pressure/temperature ratings
Flanged Ends: CL1500 or 2500 J raised‐face (RF) or
J ring‐type joint (RTJ) flanges per ASME B16.5
(1)
Whisper Trim™ III Cages: J Linear or J modified
characteristics available upon request
Flow Direction
Normally flow down (in through the cage windows
and out through the seat ring) for all cage styles
except for applications using either a Whisper Trim III
cage or a diverter cone plug, both of which are flow
Shutoff Classifications
See table 2
Bore seal trim: High‐temperature, Class V.
See table 3
up only
Additional Specifications
For specifications such as materials, valve plug
travels, and port, yoke boss, and stem diameters, see
the Parts List section
Flow Characteristic
Standard Cages: J Linear, J equal percentage, or
J modified equal percentage
1. The pressure or temperature limits in this manual and any applicable standard limitations should not be exceeded.
2. Valves using an equal percentage cage may be travelled an additional 13 mm (0.5 inch) if desired to obtain additional capacity; flow characteristic becomes modified equal percentage.
Table 2. Shutoff Classifications
EHT w/ PEEK
1. Per ANSI/FCI 70‐2 and IEC 60534‐4
2. Poly Ether Ether Ketone
(2)
(1)
Valve Design ANSI/FCI LEAKAGE CLASS
EHD
EHT
(2)
Anti‐Extrusion Rings V to 316_C (600_F)
Approximate Weights
See table 4
III—Standard
IV—Optional
IV—Standard
V—Optional
Description
The EHD and EHT valves, shown in figure 1, are large, sliding‐stem, high‐pressure, globe‐style valves. These valves
have metal seats, cage guiding, and push‐down‐to‐close valve plug action.
The EHD and EHT valves feature balanced valve plugs. To provide a seal between the valve plug and cage, the EHD
valve plug has piston rings; the EHT valve plug has a pressure‐assisted seal ring.
Bore seal trim is available for EHD valves, CL1500, NPS 8 and 10 and CL2500, NPS 8, 10, 12, and 14.
With Bore seal trim, a balanced valve can achieve high‐temperature, Class V shutoff. Because the Bore seal plug seal is
formed from metal (N07718 nickel alloy) rather than an elastomer, a valve equipped with the Bore seal trim can be
applied in processes with a fluid temperature of up to 593_C (1100_F), provided other material limits are not
exceeded.
Specifications
Specifications for the EHD and EHT valves are shown in table 1.
2
Instruction Manual
D100392X012
EH Valves NPS 8 through 14
June 2017
Educational Services
For information on available courses for the Fisher EH NPS 8 through 14 valve, as well as a variety of other products,
contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: education@emerson.com
emerson.com/fishervalvetraining
Table 3. Additional Shutoff Classification
Valve Design
(PRESSURE RATING)
EHD
(CL1500)
EHD
(CL2500)
Valve Size, NPS Port Diameter, Inches Cage Style
Equal Percentage
10
10
12
14
8
8
7
Equal Percentage, Modified Equal Percentage,
5.375
Equal Percentage, Modified Equal Percentage,
7
Modified Equal Percentage
Linear (std. cage)
Linear (Whisper III, A1, B3, C3)
Linear (std. cage),
Linear (Whisper III, A1, B3, C3, D3)
Linear (std. cage),
Linear (Whisper III, A1, B3, C3, D3)
ANSI/FCI Leakage
Class
V with
optional Bore seal trim
V with
optional Bore seal trim)
V with
optional Bore seal trim)
Table 4. Approximate Weights (Valve Body and Bonnet Assemblies)
VALVE
SIZE,
NPS
8 1400 3100 1700 3700 1900 4100 2200 4700
10 1500 3300 1900 4100 2000 4400 ‐ ‐ ‐ ‐ ‐ ‐
12 3400 7300 3900 8600 3400 7600 ‐ ‐ ‐ ‐ ‐ ‐
14 3400 7300 ‐ ‐ ‐ ‐ ‐ ‐ 3400 7600 ‐ ‐ ‐ ‐ ‐ ‐
Buttwelding Ends Flanged Buttwelding Ends Flanged
Kilograms Pounds Kilograms Pounds Kilograms Pounds Kilograms Pounds
CL1500 CL2500
WEIGHTS
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
To avoid personal injury or property damage resulting from the sudden release of pressure, do not install the valve
assembly where service conditions could exceed the limits given in this manual or on the appropriate nameplates. Use
pressure‐relieving devices 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.
3
EH Valves NPS 8 through 14
June 2017
Instruction Manual
D100392X012
CAUTION
The valve configuration and construction materials were selected to meet particular pressure, temperature, pressure drop,
and controlled fluid conditions. Because some body/trim material combinations are limited in their pressure drop and
temperature range capabilities, do not apply any other conditions to the valve without first contacting your Emerson sales
office or Local Business Partner.
If hoisting the valve, use a nylon sling to protect the painted surfaces. Carefully position the sling to prevent damage to the
actuator tubing or any accessories. Also, take precautions to prevent personnel from being injured in case the hoist or
rigging slips unexpectedly. Refer to table 4 for valve assembly weights and the appropriate actuator instruction manual for
actuator assembly weights. Be sure to use adequately sized hoists and chains or slings to handle the valve and actuator
assembly.
1. Before installing the valve, inspect it to ensure that the valve body cavity is free of foreign material.
2. Clean out all pipelines to remove scale, welding slag, and other foreign materials before installing the valve.
Note
If installing a valve with small internal flow passages, such as with Whisper Trim III or Cavitrol™ III cages, consider installing an
upstream strainer to prevent the lodging of particles in these passages. This is especially important if the pipeline cannot be
thoroughly cleaned or if the flowing medium is not clean.
3. Install the control valve with the valve body in a horizontal pipeline and the actuator vertical above the valve. Other
orientations may result in shortened trim life and difficulty with field maintenance. Flow through the valve body
must be in the direction indicated by the flow arrow (key 15, figure 12 or 14) on the valve body.
CAUTION
Depending on valve body materials used, post‐weld heat treating might be needed. Post‐weld heat treatment can damage
internal elastomeric, plastic, and metal parts. Shrink‐fit pieces and threaded connections might also loosen. In general, if
post‐weld heat treating is needed, remove all trim parts. Contact your Emerson sales office or Local Business Partner for
additional information.
4. Use accepted piping and welding practices when installing the valve in the line. For flanged valve bodies, use
suitable gaskets between the valve body flanges and pipeline flanges.
5. Install a three‐valve bypass around the control valve if continuous operation is required during maintenance.
6. If the actuator and valve are shipped separately, see the Actuator Mounting procedure.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however some
readjustment will be required to meet specific service conditions.
7. If the valve was shipped without packing installed in the packing box, install the packing prior to putting the valve
into service. Refer to instructions given in the Packing Maintenance section of this manual.
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Instruction Manual
D100392X012
EH Valves NPS 8 through 14
June 2017
Principle of Operation
Key numbers referenced in this section are shown in figure 12 for the EHD valve and in figure 14 for the EHT valve.
EHD and EHT valves are balanced designs. When they are opening or closing, pressure registers on top of the valve
plug (key 3) through the registration holes in the plug. The force of the pressure on top of the plug balances the force
of the pressure on the bottom of the plug to reduce the actuator force required.
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 lubrication and
maintenance, trim maintenance, and lapping of metal seats. All maintenance operations can be performed with the
valve in the line.
WARNING
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
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
on both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power 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.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
WARNING
Refer to table 4 for valve assembly weights and the appropriate actuator instruction manual for actuator assembly weights.
Due to the size and weight of the valve and actuator assembly, be sure adequately sized hoists and chains or slings are used
to handle it. Also, take proper precautions to prevent personnel from being injured if the hoist or rigging slips
unexpectedly.
Note
Whenever a gasket seal is disturbed by removing or shifting gasketed parts, install a new gasket upon reassembly. This is necessary
to ensure a good gasket seal.
5
EH Valves NPS 8 through 14
June 2017
Instruction Manual
D100392X012
8. After all maintenance is complete, refer to the Trim Replacement procedure to assemble the valve body.
Note
If the valve has ENVIRO‐SEAL™ live‐loaded packing installed, see the Fisher instruction manual titled ENVIRO‐SEAL Packing System
for Sliding‐Stem Valves (D101642X012
) for packing instructions.
If the valve has HIGH‐SEAL live‐loaded packing installed, see the Fisher instruction manual titled HIGH‐SEAL Live‐Loaded Packing
System (D101453X012
) for instructions.
Figure 2. Lubricator and Lubricator/Isolating Valve
14
LUBRICATOR
14
27
10A9421‐A
AJ5428‐D
A0832‐2
LUBRICATOR/ISOLATING VALVE
Packing Lubrication
WARNING
To avoid personal injury or property damage resulting from fire or explosion, do not lubricate packing used in oxygen
service or in processes with temperatures over 260_C (500_F).
CAUTION
Do not lubricate graphite packing. Graphite packing is self-lubricated. Additional lubrication may result in slip-stick
movement of the valve.
Note
ENVIRO‐SEAL or HIGH‐SEAL packing does not require lubrication.
6
Instruction Manual
D100392X012
EH Valves NPS 8 through 14
June 2017
A lubricator or lubricator/isolating valve (figure 2) is recommended for PTFE‐impregnated composition packing. The
lubricator or lubricator/isolating valve is installed in place of the pipe plug in the bonnet. Use a good quality
silicon‐base lubricant. Do not lubricate packing used in oxygen service or in processes with temperatures over 260_C
(500_F). To operate the lubricator, turn the cap screw clockwise to force lubricant into the packing box. The
lubricator/isolating valve operates the same way except open the isolating valve before turning the cap screw and then
close the isolating valve after lubrication is completed.
Packing Maintenance
WARNING
Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the packing
might require readjustment to meet specific service conditions.
Valves with ENVIRO‐SEAL live‐loaded packing or HIGH‐SEAL live‐loaded packing installed probably will not require this
initial re‐adjustment. See the Fisher instruction manuals titled ENVIRO‐SEAL Packing System for Sliding‐Stem Valves
(D101642X012
To convert an existing packing arrangement to ENVIRO‐SEAL packing, refer to the retrofit kits listed in the parts kit
sub‐section near the end of this manual. Figure 10 shows typical ENVIRO‐SEAL packing systems.
) or HIGH‐SEAL Live‐Loaded Packing System (D101453X012) (as appropriate) for packing instructions.
For spring‐loaded PTFE V‐ring packing (figure 4), the spring maintains a sealing force on the packing. If leakage is
noted around the packing follower (key 13, figure 11), check to be sure the shoulder on the packing follower is
touching the bonnet (key 1, figure 11). If the shoulder is not touching the bonnet, tighten the packing flange nuts (key
5, figure 11) until the shoulder on the packing follower is against the bonnet. If the packing leakage is still excessive,
replace the packing by following the Replacing Packing procedure.
If packing leakage is undesirable with other than spring‐loaded PTFE V‐ring packing, first try to limit the leakage and
establish a stem seal by tightening the packing flange nuts (key 5, figure 11) to at least the minimum recommended
torque in table 5. However, do not exceed the maximum recommended torque in table 5 or excessive friction may
result.
Table 5. Recommended Packing Flange Nut Torques
STEM DIAMETER
mm Inches Min Max Min Max
31.8 1‐1/4
50.8 2
VALVE
RATING
CL1500 68 102 50 75
CL2500 81 122 60 90
CL1500 98 146 72 108
CL2500 115 170 85 125
NSm LbfSft
If the packing is relatively new and tight on the stem, and if tightening the packing flange nuts does not stop the
leakage, the valve stem may be worn or nicked so that a seal cannot be made. The surface finish of a new stem is
critical for making a good packing seal. If the leakage comes from the outside diameter of the packing, the leakage
may be caused by nicks or scratches around the packing box wall. While replacing the packing according to the
Replacing Packing procedure, inspect the stem and packing box wall for nicks or scratches.
Replacing Packing
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
7
EH Valves NPS 8 through 14
June 2017
Instruction Manual
D100392X012
Key numbers referred to in this procedure are shown in figure 11 unless otherwise indicated.
1. Remove the stem connector cap screws shown in figure 3, and separate the two halves of the stem connector. Then
exhaust all actuator pressure, if any was applied, and disconnect the actuator supply and any leakoff piping.
2. Remove the hex nuts (key 26) and remove the actuator from the bonnet (key 1). Loosen the packing flange nuts
(key 5) so that the packing (key 6, or 7 and 9, figure 4) is not tight on the valve plug stem (key 4, figure 12 or 14).
Remove any travel indicator disk and stem locknuts from the valve plug stem threads.
WARNING
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. To avoid personal injury or property
damage caused by uncontrolled movement of the bonnet, loosen the bonnet by following the instructions in the next step.
Figure 3. Actuator Mounting
ANTI‐ROTATION GROOVE
STEM
CONNECTOR
CAP SCREWS
TRAVEL INDICATOR
STEM CONNECTOR
POINTER
STEM LOCKNUTS
MOUNTING STUDS & NUTS
15A4691‐A
A2359‐2
Note
The following step also provides additional assurance that the valve fluid pressure has been relieved.
3. Hex nuts (key 14, figures 12 and 14) attach the bonnet to the valve body. Loosen these nuts approximately 3 mm
(1/8 inch). Then loosen the body‐to‐bonnet gasketed joint by either rocking the bonnet or prying between the
bonnet and valve body. Work the prying tool around the bonnet until the bonnet loosens. If no fluid leaks from the
joint, proceed with the bonnet removal in step 5.
WARNING
If the cage sticks to the bonnet, proceed carefully with bonnet removal until the cage windows are accessible. Do not
extend hands or arms through the windows at this point as a sudden separation of bonnet and cage will cause personal
8
Instruction Manual
D100392X012
injury. Use a stick or other device to thread a rope or sling through the windows. Use this rigging to secure the cage to the
bonnet or hoist to prevent damage or injury should the cage suddenly separate from the bonnet.
EH Valves NPS 8 through 14
June 2017
CAUTION
When lifting the bonnet (key 1), be sure that the valve plug and stem assembly (keys 3 and 4, figure 12 or 14) remains on
the seat ring (key 6, figure 12 or 14). This avoids damage to the seating surfaces as a result of the assembly dropping from
the bonnet after being lifted part way out. The parts are also easier to handle separately.
4. Remove the hex nuts (key 14, figure 12 or 14) and washers (key 29 and 33, figure 12, 13, or 14). Carefully lift the
bonnet off the valve plug stem. If the valve plug assembly starts to lift with the bonnet, use a brass or similar
hammer to tap the end of the stem and tap it back down. Set the bonnet on a protective surface to prevent damage
to the bonnet gasket surface.
CAUTION
Use care to avoid damaging gasket sealing surfaces.
EHD piston rings (key 8) are brittle and in two halves. Use care to avoid damage to the piston rings caused by dropping or
rough handling.
5. Lift the plug assembly (keys 3 and 4, figure 12 or 14) out of the valve body.
6. To remove the cage (key 2, figure 12 or 14), if it remained in the valve body, install eyebolts or similar devices into
the 1/2 inch 13‐UNC tapped holes in the top of the cage. Using the eyebolts, carefully lift the cage out of the valve
body. Remove the top and bottom cage gaskets (key 11, figure 12 or 14). Carefully remove any residual silver or tin
from the gasket surfaces.
7. Cover the opening in the valve body to protect the gasket surface and to prevent foreign material from getting into
the valve body cavity.
Table 6. Body‐to‐Bonnet Bolting Torques
VALVE SIZE
NPS
8, 10
12, 14
VALVE
RATING
CL1500 2710 2000 2035 1500
CL2500 4070 3000 3050 2250
CL1500 8130 6000 6100 4500
CL2500 5830 4300 4370 3225
B7, B16, BD, 660 STUDS B8, B8M STUDS
NSm lbfSft NSm lbfSft
8. Remove the packing flange nuts, packing flange, upper wiper and packing follower. 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 these metal packing parts shown in the figure 4 arrangements: packing
box ring, spring, lantern ring, washer if used, and packing follower (keys 11, 8, 10, and 13).
9. Inspect the valve plug stem threads for any sharp edges that might cut the packing. Use a whetstone or emery cloth
to smooth the threads if necessary.
10. Remove the protective covering from the valve body cavity, and install the cage using new cage gaskets (key 11,
figure 12 or 14).
11. Install the plug and stem assembly. Be sure the seal ring or piston rings are installed correctly as described under
Trim Replacement.
9
EH Valves NPS 8 through 14
June 2017
Figure 4. Packing Arrangements
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
FEMALE
ADAPTOR
(KEY 32)
V‐RING (KEY 7)
MALE ADAPTOR
(KEY 31)
WASHER (KEY 10)
SPRING (KEY 8)
PACKING BOX
RING (KEY 11)
12A8160‐A
PTFE V‐RING
SINGLE PACKING
LOWER WIPER
(KEY 30)
GRAPHITE LAMINATE
KEY 6
1
14A3412‐B
PACKING RING (KEY 7)
GRAPHITE LAMINATE AND FILAMENT
SINGLE PACKING
PACKING FOLLOWER
(KEY 13)
2
GRAPHITE FILAMENT
PACKING RING (KEY 9)
3
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
13A0112‐A
Instruction Manual
GRAPHITE/COMPOSITION
DOUBLE PACKING
D100392X012
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
PACKING RING
(KEY 7)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
FEMALE ADAPTOR
(KEY 32)
V‐RING (KEY 7)
MALE ADAPTOR
(KEY 31)
LANTERN RING
(KEY 8)
PACKING BOX
12A7839‐A
Sht 1
PTFE V‐RING
DOUBLE PACKING
RING (KEY 11)
LOWER WIPER (KEY
30)
PACKING ARRANGEMENTS FOR 31.8 mm (1‐1/4 INCH) VALVE STEMS
PACKING
FOLLOWER (KEY 13)
GRAPHITE
LAMINATE
PACKING RING
(KEY 7)
1
14A3419‐B
GRAPHITE LAMINATE AND FILAMENT
SINGLE PACKING
NOTES:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS.
1
USE ONLY ONE BELOW EACH GRAPHITE LAMINATE RING.
C0634‐1
GRAPHITE FILAMENT
PACKING RING
(KEY 9)
LANTERN RING
(KEY 8)
PACKING
BOX RING (KEY 11)
PACKING ARRANGEMENTS FOR 50.8 mm (2‐INCH) VALVE STEMS
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
GRAPHITE LAMINATE
KEY 6
1
1
14A3414‐B
GRAPHITE LAMINATE AND FILAMENT
DOUBLE PACKING
1
2
3
1
14A3418‐A
GRAPHITE LAMINATE AND FILAMENT
DOUBLE PACKING
PACKING RING (KEY 7)
2
GRAPHITE FILAMENT
PACKING RING (KEY 9)
3
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
12A8163‐A
PTFE/COMPOSITION
DOUBLE PACKING
PACKING
FOLLOWER
(KEY 13)
GRAPHITE
LAMINATE
PACKING RING
2
(KEY 7)
GRAPHITE
FILAMENT
PACKING RING
(KEY 9)
3
LANTERN RING
(KEY 8)
PACKING
BOX RING
(KEY 11)
13A0029‐A
GRAPHITE/COMPOSITION AND PTFE/COMPOSITION
DOUBLE PACKING
2
HAS THE APPEARANCE OF FLAT WASHERS PRESSED TOGETHER.
HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.
3
PACKING FOLLOWER
(KEY 13)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
10
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