Fisher Instruction Manual: Fisher NPS 8 CHP Control Valve Manuals & Guides

Instruction Manual

D104197X012

Fisher™ NPS 8 CHP Control Valve

NPS 8 CHP Valve

June 2017

Contents

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

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

Description 2.................................

Specifications 2...............................

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

Lifting Guidelines 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 11..........................

Parts Ordering 12...............................

Parts List 13...................................

Introduction

Scope of Manual

Figure 1. Fisher CHP NPS 8 Control Valve

X1365

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

www.Fisher.com

NPS 8 CHP Valve

June 2017

Table 1. Specifications

Instruction Manual

D104197X012

Size/Pressure Class/Body Materials

NPS 8 / CL2500 / WCC, WC9

Maximum Inlet Pressure and Temperature

Consistent with ASME B16.34 except CHPT PEEK
anti‐extrusion seal ring construction. Maximum
temperature limit is 380_C (716_F).

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/NCF2
Nuts: Steel A 194‐2H/NCF2

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.

(1)

Flow Coefficient

Maximum Cv: 514 Km: 0.74 Fl: 0.86
Modified Equal Percentage

Flow Direction

Flow down and up

Stem Diameter

1‐1/4 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 V with Bore seal (standard)

Weight

Estimated Valve Body and Bonnet Assemblies 810 kg
Please consult Singapore SD&S for any queries

(2)

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.

Educational Services

For information on available courses for the Fisher CHP valve, as well as a variety of other products, contact:

Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [e-mail]
emerson.com/fishervalvetraining

Specifications

Specifications for the CHP valves are shown in table 1.

2

Instruction Manual

D104197X012

NPS 8 CHP Valve

June 2017

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.

CAUTION

When ordered, 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 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.

Lifting Guidelines

CAUTION

Care must be taken when lifting the valve/actuator assembly to ensure the accessories and tubing are not damaged in the
process. The entire assembly with accessories weighs approximately 1500 kg (3310 lb). Make sure to use appropriate
lifting straps/hoist rings capable of lifting this weight.

3

NPS 8 CHP Valve

June 2017

Instruction Manual

D104197X012

WARNING

Avoid personal injury or damage caused by uncontrolled movement or dropping of the assembly valve:

D Swivel hoist rings are sized to lift only the valve and actuator. Do not attached piping or other structures to the valve

and actuator assembly when lifting swivel hoist rings.

D Take appropriate precautions to avoid unbalanced loading which may result in sudden swinging or movement of the

assembled unit, including additional lifting and/or support methods when necessary.

D Do not use eyebolts when lifting the valve or valve actuator assembly due to variable loading angles inherent to valve

maintenance and installation.

D Failure to utilize safe lifting practices may result in equipment damage and/or personal injury.

Lifting Valve/Actuator Assembly

To lift the assembly, insert swivel hoist rings (recommend 3/4-10 UNC) into the four lifting hole locations on the
outside diameter of the bonnet flange. The lifting point must be high enough away from the top of the accessory
mountings to prevent damage to accessories or piping. When lifting the valve and actuator assembly, a strap around
the actuator may be required to ensure lifting stability. Lifting the assembly without using the hoist rings is not
preferred.

Lifting Bonnet Only

To lift the bonnet, insert swivel hoist rings (recommend 3/4-10 UNC) into the four lifting hole locations on the outside
diameter of the bonnet flange. Use proper length, or adjustable chains to ensure the bonnet and valve body mating
surfaces remain parallel when hoisted.

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.

4

Instruction Manual

D104197X012

NPS 8 CHP Valve

June 2017

D Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

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)

5

NPS 8 CHP Valve

June 2017

Instruction Manual

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 4240 3130

SA193‐B7, B16

D104197X012

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 1‐1/4 735-993 544-736 6.38-6.45 0.251-0.254

1. VSC (Valve Stem Connection) size is 1 1/4-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 maintains a sealing force on the packing. If leakage is noted
around the packing follower, 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 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 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
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.

6