Fisher Maintenance Packing System for Fisher Sliding-Stem Valves in Power Plant Applications Manuals & Guides

Instruction Manual

D104566X012

Maintenance Packing System for Sliding-Stem Valves

October 2020

Maintenance Packing System for Fisher

™

Sliding-Stem Valves in Power Plant Applications

Contents

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

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

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

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

Tightening Procedures 4.......................

Other Considerations 5..........................

Parts Ordering 5................................

Figure 1. Fisher easy-e Valve Bonnet with
Maintenance Packing System

PACKING
FLANGE

PACKING
FOLLOWER

VALVE
BONNET

W5814-1*

VALVE
STEM

BELLEVILLE
SPRINGS

Introduction

Scope of Manual

This instruction manual includes installation and parts information for a Maintenance Packing System that uses
ENVIRO-SEAL™ live-loaded components (see figure 1). This system can be installed in Fisher Sliding-Stem valves with

12.7, 19.1, 25.4, 31.8 mm, and 50.8 mm (1/2, 3/4, 1, 1-1/4, and 2-inch) diameter stems as shown in table 2. Refer to
appropriate valve and actuator instruction manuals for necessary information relating to the disassembly and
assembly of the valve and actuator.

Do not install, operate, or maintain Maintenance Packing Systems 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

www.Fisher.com

before proceeding.

Maintenance Packing System for Sliding-Stem Valves

October 2020

Table 1. Specifications

Instruction Manual

D104566X012

Applicable Product Types and Stem Diameters

See table 2

Pressure Limit

(1)

Temperature Limits

Minimum: -40°C (-40°F)
Maximum: 524°C (975°F)

(2)

Maximum Pressure: 310 bar (4500 psi)

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

2. The valves shown are only guidelines. These guidelines can be exceeded, but shortened packing life or increased leakage might result. The temperature ratings apply to the actual packing
temperature, not to the process temperature.

Description

This Maintenance Packing System is available only for field Installation in Fisher valves. It is intended for use in Steam
Service in conventional (non-nuclear) power plants that exceed the pressure and temperature limits of ENVIRO-SEAL
packing offerings.

This system is intended for use only in non-environmental applications and has not been tested for fugitive emission
service. The external live-loading provides elevated packing stress and compensates for packing wear and
consolidation. Periodic adjustment of the packing nuts may be required until the packing nut torque stabilizes.

Maintenance Packing System systems utilize Belleville (coned-disk) springs located on a PTFE lined follower. If the
piping and valve are insulated, do not allow insulation to extend above the yoke boss surface. Insure the packing
follower is exposed to ambient air conditions to provide adequate cooling. For applications that exceed the
temperature capability of the standard PTFE lined follower, a PEEK lined follower is available. Contact your Emerson

sales office for details.

Table 2. Fisher Sliding-Stem Product Availability for Maintenance Packing System

VALVE TYPE

(ED, ES, ET, EW, EZ)

1. Contact your Emerson sales office for valves not listed.

(1)

A X X X X - - -

CAV4 - - - X X X X

DBQ X X X X - - -

easy-e

EH X X X X X

ENA - - - - - - - - - X X

FB - - - - - - X X X

HP X X X X - - -

YD X X X X - - -

YS X X X X - - -

12.7

(1/2)

X X X X - - -

19.1

(3/4)

STEM DIAMETER, mm (INCHES)

25.4
(1)

31.8

(1-1/4)

50.8
(2)

2

Instruction Manual

D104566X012

Maintenance Packing System for Sliding-Stem Valves

October 2020

Installation

If you are changing the packing system, it is good practice to review actuator sizing, as packing friction will change.
See tables 3 and 4 for information on packing friction.

WARNING

Avoid personal injury from sudden release of process pressure or uncontrolled movement of parts. 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

from 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 other hazards that may be present from exposure to process media.

If you are installing the system in a valve that is still connected to an actuator, remove the actuator from the valve to
provide sufficient space to install the packing assembly. If a spring-return actuator is used, it is possible that
disconnecting the stem connector will allow the spring to force the actuator to the end of its travel. Be sure the
actuator spring is resting on its travel stop. Refer to the appropriate valve and actuator instruction manuals to remove
the actuator.

Remove old packing parts from the packing box by using the valve instruction manual procedures. Both the valve stem
surface condition and the packing bore are critical in obtaining a good seal. If the valve stem surface is scratched,
nicked, or worn, replace the valve stem before installing the Maintenance Packing System. Check the condition of the
packing bore and clean or hone it out, as necessary. Refer to the appropriate valve instruction manual to replace the
valve stem.

Then proceed as follows:

1. The original packing flange studs used for standard packing arrangements should be long enough to accommodate
the retrofit kit parts. If you determine that the existing studs and nuts should be replaced however, due to their
condition, replace them with the studs and nuts (keys 200 and 212) specified in the parts section of this manual.

2. Carefully remove the old packing parts from the packing box. If the valve stem or packing box wall is scratched or
damaged, it can cause excessive leakage. If the valve stem needs to be replaced, or any other valve part, refer to the
appropriate valve instruction manual for replacement procedures. Complete all valve maintenance before installing
the Maintenance Packing System into the bonnet.

Table 3. Packing Friction at Ambient Temperature

VALVE STEM DIAMETER MAINTENANCE PACKING

mm Inches Newtons Pounds (Force)

12.7

19.1

25.4

31.8

1/2
3/4

1

1-1/4

1980
4580
7250
9470

445
1030
1630
2130

3