Fisher Fisher CHP Control Valve Manuals & Guides

Instruction Manual

D103463X012

Fisher™ CHP Control Valve

CHP Valve

June 2017

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Specifications 1...............................

Installation 3..................................

Maintenance 4.................................

Packing Maintenance 6.........................

Adding Packing Rings 7.....................

Replacing Packing 7........................

Trim Removal 10..............................

Valve Plug Maintenance 10.....................

Lapping Seats 11..............................

Trim Replacement 12..........................

Parts Ordering 13...............................

Parts Kits 14...................................

Parts List 14...................................

Introduction

Figure 1. Fisher CHP NPS 12 Control Valve

Scope of Manual

This instruction manual includes installation, maintenance, and parts information for the Fisher CHP control valve.
Refer to separate manuals for instructions covering the actuator, positioner, and accessories.

Do not install, operate, or maintain CHP valves 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.

or Local Business Partner before

Description

The CHP globe valve (figure 1) has a metal seat, cage guiding, quick change trim, and push‐down‐to‐close valve plug
action. The valve uses a balanced valve plug. To provide a seal between the cage and a balanced valve plug, the
balanced valve plug uses a PEEK (Poly Ether Ether Ketone) anti-extrusion ring with a pressure‐assisted spring‐loaded
seal ring.

Specifications

Specifications for the CHP valves are shown in table 1.

www.Fisher.com

CHP Valve

June 2017

Table 1. Specifications

Instruction Manual

D103463X012

Size/Pressure Class/Body Materials

NPS 12 / CL2500 / WCC, WC9

Maximum Inlet Pressure and Temperature

(1)

Consistent with ASME B16.34 except CHPT PEEK
anti‐extrusion seal ring construction. Maximum
temperature limit is 316_C (600_F). For temperature
exceeding 316_C (600_F), please consult Singapore
SD&S

End Connection Style

Buttweld Ends : All buttwelding end schedules per
ASME B16.25

Bonnet and Body‐to‐Bonnet Bolting

Plain Bonnet: 5 inch H Yoke Boss
Studs: Steel A 193‐B7
Nuts: Steel A 194‐2H

1. The pressure/temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded.

2. For Boiler feedwater application, proper use of a block valve during closing of the control valve is recommended to minimize control valve trim damage.

Flow Coefficient

Maximum Cv: 1040 Km: 0.65 Fl: 0.81
Modified Equal Percentage

Flow Direction

Flow down (in through the cage windows and out
through the seat ring) except for service with
pressure drop exceeding 69 bar (1000psi) when a
diverter cone plug is used

Stem Diameter

1‐1/4 inch with 2‐inch VSC (Valve Stem Connection)

Shutoff Classification per ANSI/FCI 70‐2 and IEC
60534-4

CHPT: Class IV (standard), Class V (optional)
CHPD: Class III

(2)

Weight

Estimated 2000 kg
Please consult Singapore SD&S for any queries

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Installation

WARNING

Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.

Personal injury or property 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.

WARNING

A bonnet flange has a tapped hole that was used to handle the bonnet during manufacture. Since this tapped hole was not
designed or intended to support the weight of the valve/bonnet assembly, do not use this tapped hole to lift the valve
assembly or personal injury may result from the assembly falling.

CAUTION

When ordered, the valve configuration and construction materials were selected to meet particular pressure, temperature,
pressure drop, and controlled fluid conditions. Since some body/trim material combinations are limited in their pressure
drop and temperature ranges, do not apply any other conditions to the valve without first checking with your Emerson

sales office or Local Business Partner.

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.

3. Flow through the valve must be in the direction indicated by the flow arrow, which is attached to the valve body.

4. Use accepted piping practices when installing the valve in the pipeline.

5. Install a three‐valve bypass around the valve if continuous operation is required during maintenance.

6. If the actuator and valve body are shipped separately, refer to the actuator mounting procedure in the appropriate
actuator instruction manual.

7. If the valve body was shipped without packing installed in the packing box, install the packing before putting the
valve body into service. Refer to instructions given in the Packing Maintenance procedure.

WARNING

Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the packing
might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.

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Maintenance

Refer to figure 4.

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 damage to property from sudden release of pressure or uncontrolled process fluid. Before starting
disassembly:

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.

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Figure 2. 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

12A7839‐A
Sht 1

PTFE V‐RING

DOUBLE PACKING

NOTES:

1

0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS.
USE ONLY ONE BELOW EACH GRAPHITE LAMINATE RING.

C0634‐1

LOWER WIPER
(KEY 30)

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 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

KEY 6

1

14A3412‐B

PACKING RING (KEY 7)

2

GRAPHITE FILAMENT
PACKING RING (KEY 9)

3

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

GRAPHITE LAMINATE AND FILAMENT

SINGLE PACKING

PACKING FOLLOWER
(KEY 13)

GRAPHITE LAMINATE

KEY 6

1

1

14A3414‐B

PACKING RING (KEY 7)

2

GRAPHITE FILAMENT
PACKING RING (KEY 9)

3

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

GRAPHITE LAMINATE AND FILAMENT

DOUBLE PACKING

2

HAS THE APPEARANCE OF FLAT WASHERS PRESSED TOGETHER.

3

HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.

13A0112‐A

GRAPHITE/COMPOSITION

DOUBLE PACKING

12A8163‐A

PTFE/COMPOSITION

DOUBLE PACKING

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)

PACKING RING
(KEY 7)

LANTERN RING
(KEY 8)

PACKING BOX RING
(KEY 11)

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Table 2. CL2500 Recommended Torque for Packing Flange Nuts (non live‐loaded)

VALVE STEM

DIAMETER

mm Inches Min Max Min Max

31.8 1‐1/4 CL2500 81 122 60 90

PRESSURE RATING

NSm lbfSft

TORQUE

Table 3. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant

BOLT TORQUES

VALVE RATING

NSm lbfSft

CL2500 5760 4260

SA193‐B7, B16

D103463X012

Table 4. Valve Stem Connection Torque and Hole Size for Pin

VALVE STEM DIAMETER TORQUE, MINIMUM TO MAXIMUM HOLE SIZE

mm Inches NSm LbfSft mm Inch

31.8 1‐1/4 827‐908 610‐670 9.53 ‐ 9.65 0.375 ‐ 0.380

1. VSC (Valve Stem Connection) size is 2-inch.

(1)

CAUTION

The CHP valve uses spiral‐wound gaskets which are crushed to provide their seal. A spiral‐wound gasket should never be
reused. Whenever a gasket seal is disturbed by removing or shifting gasketed parts, a new gasket must be installed upon
reassembly. This is necessary to ensure a good gasket seal, since the used gasket will not seal properly.

The spiral‐wound gaskets are of special design. Failure to use genuine Fisher replacement parts may result in valve damage
and/or failure.

Packing Maintenance

Key numbers refer to figure 2 for PTFE V‐ring packing and graphite ribbon/filament, unless otherwise indicated.

WARNING

To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing
box wall for nicks or scratches while performing the following procedures.

Use care to avoid damaging these surfaces.

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 21, figure 4) until the shoulder
is against the bonnet. If leakage cannot be stopped in this manner, proceed to the Replacing Packing procedure.

If there is undesirable packing leakage 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 21, figure 4) to at least the minimum
recommended torque in table 2. However, do not exceed the maximum recommended torque in table 2 or excessive
friction may result. If leakage continues, replace the packing by following the numbered steps presented in the
Replacing Packing procedure.

If the packing is relatively new and tight on the valve plug stem, and if tightening the packing flange nuts does not stop
the leakage, it is possible that the stem is worn or nicked so that a seal cannot be made. The surface finish of a new

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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. While replacing the packing
according to the Replacing Packing procedure, inspect the valve plug stem and packing box wall for nicks or scratches.

Adding Packing Rings

WARNING

Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.

To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing
box wall for nicks or scratches while performing the following procedures.

Use care to avoid damaging these surfaces.

Key numbers referred to in this procedure are shown in figure 4, unless otherwise indicated.

When using packing with a lantern ring it may be possible to add packing rings above the lantern ring as a temporary
measure without removing the actuator from the valve body.

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, 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.

2. Remove the packing flange nuts (key 21) and lift the packing flange, upper wiper, and packing follower (keys 19, 27,
and 28) away from the valve body.

3. It may be possible to dig out the old packing rings on top of the lantern ring, but use care to avoid scratching the
valve plug stem or packing box wall. Clean all metal parts to remove particles that would prevent the packing from
sealing.

4. Remove the stem connector and slip the packing rings over the end of the valve plug stem.

5. Reassemble the packing follower, upper wiper, packing flange, and packing flange nuts (keys 28, 27, 19, and 21).

6. Reconnect the body‐actuator stem connection according to the appropriate actuator instruction manual.

7. Tighten the packing flange nuts only far enough to stop leakage under operating conditions. Check for leakage
around the packing follower when the valve is being put into service. Retighten the packing flange nuts as required
(see table 2).

Replacing Packing

WARNING

Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.

To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing
box wall for nicks or scratches while performing the following procedures.

Use care to avoid damaging these surfaces.

Key numbers referred to in this procedure are shown in figure 4, unless otherwise indicated.

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

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actuator, 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.

2. Remove the cap screws in the stem connector, 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.

3. Remove the hex nuts (key 30), and remove the actuator from the bonnet (key 18).

4. Loosen the packing flange nuts (key 21) so that the packing (keys 7, 9, 31, or 32, figure 2) is not tight on the valve
plug stem (key 6). Remove the stem locknuts from the valve plug stem threads.

CAUTION

When lifting the bonnet (key 18), be sure that the valve plug and stem assembly (keys 5 and 6) remains on the seat ring
(key 4). 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.

Use care to avoid damaging gasket sealing surfaces.

WARNING

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. 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.
If the cage sticks to the bonnet, proceed carefully with bonnet removal and support the cage so that it will not fall
unexpectedly from the bonnet.

Note

The following step also provides additional assurance that the valve body fluid pressure has been relieved.

5. Hex nuts (key 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 to
the next step. If fluid leaks from the joint, the process pressure was not relieved from the valve as noted in the
Warning at the beginning of the Maintenance section in this manual.

6. Unscrew the hex nuts (key 14) and carefully lift the bonnet off the valve stem. If the valve plug and stem assembly
starts to lift with the bonnet, use a brass or lead hammer on the end of the stem and tap it back down. Set the
bonnet on a cardboard or wooden surface to prevent damage to the bonnet gasket surface.

7. Remove the valve plug (key 5), bonnet gasket (key 11), cage (key 2), seat ring (key 4), and the seat ring gasket (key

12).

CAUTION

Inspect the seat ring, cage, bonnet, and body gasket surfaces. These surfaces must be in good condition, with all foreign
material removed. Small burrs less than approximately 0.076 mm (0.003 inch) in height (the thickness of a human hair) can
be ignored. Scratches or burrs that run across the serrations are not permitted under any conditions, since they will
prevent the gaskets from sealing properly.

8. Clean all gasket surfaces with a good wire brush. Clean in the same direction as the surface serrations, not across
them.

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9. Cover the opening in the valve body to protect the gasket surface and to prevent foreign material from getting into
the valve body cavity.

10. Remove the packing flange nuts (key 21), packing flange (key 19), upper wiper (key 27), and packing follower (key

28). 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.

11. Clean the packing box and the following metal packing parts: packing follower, packing box ring (key 11, figure 2),
spring or lantern ring (key 8, figure 2), and, for single arrangements of PTFE V‐ring packing only, special washer (key
10, figure 2).

12. Inspect the valve stem threads for any sharp edges that might cut the packing. A whetstone or emery cloth may
be used to smooth the threads if necessary.

13. Remove the protective covering from the valve body cavity, and install the seat ring and cage using a new seat ring
gasket (key 12), bonnet gasket (key 11). Install the plug, then slide the bonnet over the stem and onto the studs
(key 13).

Figure 3. Installing Graphite Ribbon/Filament Packing Rings One at a Time

VALVE STEM

PACKING
FOLLOWER

BONNET

TOP OF

PACKING RING

EVEN WITH
BOTTOM OF

ENTRANCE

CHAMFER

INSTALLING

FIRST PACKING RING

A2207‐2

INSTALLING

SECOND PACKING RING

Note

The prelubricated hex nuts (key 14) referred to in step 14 can be identified by a black film coating on the nut threads.

The proper bolting procedures in step 14 include‐‐but are not limited to‐‐ensuring that the bonnet stud threads are clean, and that
the hex nuts are evenly tightened to the specified torque values.

CAUTION

Failure to comply with good bonnet‐to‐body bolting practices and the torque values shown in table 3 may result in damage
to the valve. Cheater bars or slug wrenches should not be used for this procedure.

Hot torquing is not recommended.

14. Lubricate the stud threads and the faces of the hex nuts (key 14) with anti‐seize lubricant (not necessary if new
factory prelubricated hex nuts are used). Install the hex nuts and tighten them finger‐tight. Stroke the valve several
times to center the trim. Torque the nuts in a crisscross pattern to no more than 1/4 of the nominal torque value
specified in table 3.

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When all nuts are tightened to that torque value, increase the torque by 1/4 of the specified nominal torque and
repeat the crisscross pattern. Repeat this procedure until all nuts are tightened to the specified nominal value. Apply
the final torque value again and, if any nut still turns, tighten every nut again.

Note

When installing packing rings, prevent entrapping air between the rings. Add the rings one at a time without forcing them below
the chamfer of the packing box entrance chamber. As each successive ring is added, the stack should not be pushed down more
than the thickness of the added ring (figure 3).

15. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 2. If
desired, packing parts may be pre‐lubricated with a silicon base grease for easier installation. Slip a smooth‐edged
pipe over the valve stem, and gently tap each soft packing part into the packing box, being sure that air is not
trapped between adjacent soft parts.

16. Slide the packing follower, wiper, and packing flange into position. Lubricate the packing flange studs (key 20) and
the faces of the packing flange nuts (key 21). Install the packing flange nuts.

For the spring‐loaded PTFE V‐ring packing shown in figure 2, tighten the packing flange nuts until the shoulder on the
packing follower (key 28) contacts the bonnet.

Instruction Manual

D103463X012

For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 2. Then,
loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in table 2.

For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts
reaches the minimum recommended torque shown in table 2. Then, tighten the remaining flange nuts until the
packing flange is level and at a 90‐degree angle to the valve stem.

17. Mount the actuator on the valve body assembly, and reconnect the actuator and valve plug stems according to
the procedures in the appropriate actuator instruction manual.

Trim Removal

Key numbers referenced in this procedure are shown in figure 4, except where indicated.

1. Remove the actuator and bonnet by following steps 1 through 6 of the replacing packing procedure. Observe all
warnings and cautions in that procedure.

2. Lift the valve stem and attached valve plug out of the valve body. If the valve plug is to be reused, tape or otherwise
protect the valve plug stem and the valve plug seating surface to prevent scratches.

3. Lift out the cage (key 2) and the bonnet gasket (key 11).

4. Remove the seat ring (key 4) and the seat ring gasket (key 12).

5. Inspect the parts for wear or damage and replace if needed.

6. Refer to the Valve Plug Maintenance procedure or to the Lapping Seats procedure.

Valve Plug Maintenance

Key numbers used in this procedure are shown in figure 4, except where indicated.

1. With the valve plug (key 5) removed according to the trim removal procedure, proceed as appropriate:

For the CHPT valve, work the retaining ring (key 10) off the valve plug with a screwdriver. Carefully slide the backup
ring, anti‐extrusion rings (keys 9, 63, and 8), and seal ring off the valve plug.

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2. To replace the valve plug stem (key 6), drive out the pin (key 7), and unscrew the stem from the valve plug.

CAUTION

Never reuse an old stem with a new valve plug. Using an old stem with a new plug requires drilling a new pin hole in the
stem. This weakens the stem and may cause the stem to fail in service. If a new valve plug is required, always order a valve
plug, stem, and pin as an assembly. Specify the correct part number of each of the three parts, but state that the parts are
being ordered as an assembly.

A used valve plug may be reused with a new stem.

3. Thread the new stem into the valve plug and tighten it to the appropriate torque value given in table 4. Using the
valve plug pin hole as a guide, drill the pin hole through the stem. Refer to table 4 for drill sizes.

4. Drive in the pin to lock the assembly.

5. If it is necessary to lap the seating surfaces, complete the lapping seats procedure before installing the seal ring. The
Trim Replacement procedure provides seal ring installation instructions and valve reassembly instructions.

Lapping Seats

Key numbers referenced in this procedure are shown in figure 4, except where indicated.

With metal‐seat constructions, lapping seating surfaces of the valve plug and seat ring (keys 5 and 4) can improve
shutoff. (Deep nicks should be machined out rather than ground out.) Use a good quality lapping compound of a
mixture of 280 to 600‐grit. Apply the compound to the bottom of the valve plug.

Note

The CHP valve uses spiral‐wound gaskets. These gaskets provide their seal by being crushed and therefore should never be reused.
This includes reusing a gasket after the lapping procedure has been performed.

An “old” gasket can be used to lap the seat, however the gasket must be replaced with a new gasket.

To preserve the effects of lapping, do not change either the position of the seat ring in the valve body cavity or the position of the
cage on the seat ring after lapping the seating surfaces. When the parts are removed for cleaning and replacement of the “old”
gaskets, return them to the original positions.

Use the following procedure to lap the seating surfaces.

1. Install the following parts according to the instructions presented in the trim replacement procedure: “old” seat
ring gasket (key 12), seat ring (key 4), cage (key 2) and “old” bonnet gasket (key 11).

2. Install the valve plug and stem assembly (keys 5 and 6) into the cage.

3. Install the bonnet (key 18) over the valve stem, and secure the bonnet with four of the hex nuts (key 14).

4. Attach a handle, such as a piece of strap iron secured by stem locknuts, to the valve stem. Rotate the handle
alternately in each direction to lap the seats.

5. After lapping, disassemble as necessary (you may mark the position of the seat ring and cage with a soft tip
marker). Clean the seating surfaces, replace the gaskets, reassemble (taking care to return the seat ring and cage to
their original positions), and test for shutoff. Repeat the lapping procedure if necessary.

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Trim Replacement

WARNING

Observe the warning at the start of the Maintenance section.

After all trim maintenance has been completed, reassemble the valve body by following the numbered steps below. Be
certain that all gasketed surfaces have been well cleaned. Key numbers referenced in this procedure are shown in
figure 4, except where indicated.

CAUTION

Inspect the seat ring, cage, bonnet, and body gasket surfaces. These surfaces must be in good condition, with all foreign
material removed. Small burrs less than approximately 0.076 mm (0.003 inches) in height (the thickness of a human hair)
can be ignored. Scratches or burrs that run across the serrations are not permitted under any conditions, since they will
prevent the gaskets from sealing properly.

1. Install the seat ring gasket (key 12) into the valve body. Install the seat ring (key 4).

2. Install the cage (key 2).

3. Install the seal ring (key 8) onto the valve plug (key 5). Install the anti‐extrusion rings (key 63) onto the valve plug
(key 5). Install the ring with the open side facing the seat end of the valve plug for flow‐down applications (view A of
figure 4). Slide the backup ring (key 9) onto the valve plug. Secure with the retaining ring (key 10).

4. Install the valve plug into the cage.

5. Install the bonnet gasket (key 11).

6. Install the bonnet over the valve stem and onto the valve body.

Note

The prelubricated hex nuts (key 14) referred to in step 7 can be identified by a black film coating on the nut threads.

The proper bolting procedures in step 7 include‐‐but are not limited to‐‐ensuring that the bonnet stud threads are clean, and that
the hex nuts are evenly tightened to the specified torque values.

CAUTION

Failure to comply with good bonnet‐to‐body bolting practices and the torque values shown in table 3 may result in damage
to the valve. Cheater bars or slug wrenches should not be used for this procedure.

Hot torquing is not recommended.

7. Lubricate the stud threads and the faces of the hex nuts (key 14) with anti‐seize lubricant (not necessary if new
factory prelubricated hex nuts are used). Install the hex nuts, but do not tighten them. Torque the nuts in a
crisscross pattern to no more than 1/4 of the nominal torque value specified in table 3. When all nuts are tightened

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to that torque value, increase the torque by 1/4 of the specified nominal torque and repeat the crisscross pattern.
Repeat this procedure until all nuts are tightened to the specified nominal value. Apply the final torque value again
and, if any nut still turns, tighten every nut again.

8. Install new packing and packing box parts per steps 15 and 16 of the Replacing Packing procedure. Be certain to
observe the note given prior to step 15 of that procedure.

9. Mount the actuator by following the procedures in the actuator instruction manual. Check for packing leakage as
the valve is being put into service. Retorque the packing flange nuts as required. See table 2.

CHP Valve

June 2017

Parts Ordering

Each valve body‐bonnet assembly is assigned a serial number which can be found on the valve. This same number also
appears on the actuator nameplate when the valve is shipped from the factory as part of a control valve assembly.
Refer to the serial number when contacting your Emerson sales office
assistance. When ordering replacement parts, reference the valve serial number to obtain the correct eleven‐character
part number for each part; the following Parts Kit and Parts List is for information only.

WARNING

or Local Business Partner for technical

Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should
not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the
performance of the valve, and could cause personal injury and property damage.

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CHP Valve

June 2017

Instruction Manual

D103463X012

Parts Kits

Packing Kits (non live‐loaded)

Single PTFE (Contains keys 22, 24, 25, 26, 27)

Single Graphite Ribbon/Filament (Contains keys 23, 23, 24, 26)

Parts List

Numerous available combinations of valve parts make selection of some parts difficult; when ordering valve parts for
which a part number is not listed, provide the valve serial number with the order, permitting proper selection of
replacement parts to be made at the factory.

Key Description

Note

For part numbers not shown, contact your Emerson sales office
Business Partner.

Key Description

  1 Valve Body

If you need a valve body as a replacement  
  part, order by valve size, serial number,

and desired material.  
  2* Cage
  4* Seat Ring
  5* Valve Plug
  6* Valve Stem
  7* Pin
  8* Seal Ring
  9* Back Up Ring
 10* Retaining Ring  
 11* Bonnet Gasket
 12* Seat Ring Gasket
 13 Stud, Cont Thd

or Local

14 Hex Nut
 15 Anti‐Seize Lubricant
 16 Nameplate (not shown)
 17 Wire (not shown)
 18 Bonnet‐‐‐

If you need a bonnet as a replacement  
  part, order by serial number, and desired

material.  
 19 Packing Flange
 20 Stud Bolt
 21 Hex Nut
 22* Packing Set
 23* Packing Ring
 24 Spring or Lantern Ring
 25 Washer, Special
 26* Packing Box Ring
 27* Upper Wiper
 28 Packing Follower
 29 Stud Bolt
 30 Hex Nut
 33 Lower Wiper
 38 Drive Screw
 41 Flow Arrow
 63* Anti‐Extrusion Ring
 66* Carbon Steel Washer

14

*Recommended spare parts

Instruction Manual

D103463X012

Figure 4. Fisher NPS12 CHP Balanced Globe Valve Assembly

VIEW B

CHP Valve

June 2017

FLOW DOWN

5H YOKE BOSS

APPLY LUB

GG08542-A

VIEW A

FLOW

FLOW

CHPD

CHPT

15

CHP Valve

June 2017

Instruction Manual

D103463X012

Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions,
Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.

Emerson Automation Solutions

Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore

www.Fisher.com

16

E 2010, 2017 Fisher Controls International LLC. All rights reserved.