Fisher Installation Instructions: RCPXPACK112 | Fisher Manuals & Guides

ANSI

Inch

mm

1, 1 1/2

Installation Instructions
Design CP PTFE Packing

Use these instructions when inspecting or replacing
standard PTFE packing.

WARNING

Avoid personal injury or property dam­age from sudden release of process
pressure or bursting of parts. Before
performing any maintenance opera­tions:

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.

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.

1. Remove the packing flange nuts, packing flange,
and bushing (keys 212, 201, and 208). Carefully push
out all the remaining packing box parts from the bon­net using a rounded rod or other tool that will not
scratch the packing box wall or lower guide bushing.
Clean the packing box and the metal packing box
parts.

2. Inspect the valve stem threads and packing box
surfaces for any sharp edges that might cut the pack­ing. Scratches or burrs could cause packing box leak­age or damage to the new packing. If the surface
condition cannot be improved by light sanding, re­place the damaged parts.

3. Install new packing and the metal packing box
parts according to the appropriate arrangement in fig­ure 1. Place 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.

4. Slide the bushing and packing flange (keys 208
and 201) into position. Lubricate the packing flange
studs (key 200) and the faces of the packing flange
nuts (key 212). Replace the packing flange nuts, but
do not tighten.

5. For PTFE packing, tighten the packing flange nuts
alternately in small equal increments until one of the
nuts reaches the minimum recommended torque
shown in table 1. Then, tighten the remaining flange
nuts until the packing flange is level and at a 90-de­gree angle to the valve stem.

6. Mount the actuator on the valve assembly, and
reconnect the actuator and valve stem. Refer to the
appropriate valve and actuator instruction manuals
when connecting the valve to the actuator. Check for
leakage around the packing follower when the valve is
being put into service. Retighten the packing flange
nuts as required.

For additional information concerning the installation
of this packing kit, please consult the appropriate
Fisher Controls product instruction manual.

Table 1. Recommended Torque for Packing Flange Nuts

VALVE

VALVE

SIZE,

INCHES

1, 1-1/2,

DIAMETER

Inch mm

,

1/2 12.7

2

3 1 25.4

4 1-1/4 31.8

STEM

ANSI

CLASS

150 15 1.7 23 2.6
300 20 2.3 31 3.5
150 21 2.4 32 3.6
300 29 3.3 43 4.9
150 15 1.7 22 2.5
300 20 2.3 30 3.4

PTFE TYPE PACKING

Minimum

Torque

LbfSin NSm LbfSin NSm

Maximum

Torque

Fisher and Fisher-Rosemount are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.
All other marks are the property of their respective owners.

EFisher Controls International, Inc. 1996; All Rights Reserved

D300914X012 9/96

Installation Instructions
Design CP PTFE Packing

PACKING REPAIR STEM SIZE DIAMETER, IN. (mm)

RCPXPACK112 1 (25.4)

RCPXPACK122 1-1/4 (31.8)

Packing Stud - Not Shown
(Key 200)
Packing Flange Nuts - Not Shown
(Key 212)
Packing Flange - Not Shown
(Key 201)

Bushing
(Key 208)

Packing Set
(Key 215)

Lantern Ring
(Key 216)

Packing Set
(Key 215)

1-Inch 1-1/4 Inch

Figure 1.PTFE V-RING WITH ONE-PIECE BUSHING

Stems and packing box constructions that do not meet Fisher Controls stem finish specifications, dimensional
tolerances, and design specifications, may adversely alter the performance of this packing kit.

EFisher Controls International, Inc. 2000; All Rights Reserved
Fisher and Fisher-Rosemount are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.

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. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

For information, contact Fisher Controls:

Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461

Printed in U.S.A.