Installation Instructions
Design GL ENVIRO-SEALtPTFE Packing
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Use these instructions to install ENVIRO-SEAL packing in
valves that have standard packing or when inspecting or
replacing ENVIRO-SEAL 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 oper ating lines pr oviding air pressur e, electr ic power, or a contr ol
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.
Pressures and Temperatures
Maximum to Maintain Leakage of Less Than 500
ppm: Full ANSI Class 300 pressures to 450_F (232_C).
1. Carefully remove the old packing parts from the packing
box. The surface condition of the valve stem and the packing box wall is critical in obtaining a good seal. 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 ENVIRO-SEAL packing system into the bonnet.
2. If a retrofit kit is being installed in place of the original
packing, it may be necessary to remove the old stud bolts
(key 200) from the valve because they are too short for the
ENVIRO-SEAL packing parts. Refer to the Design GL
valve (North America) instruction manual, and remove the
existing stud bolts. Install the new stud bolts (key 200) from
the retrofit kit.
This product may be covered by one or more of the following patents (5,129,625; 5,056,757;
5,131,666; 5,230,498; and 5,299,812) or under pending patent applications.
ENVIRO-SEAL is a mark owned by Fisher Controls International, Inc.
eFisher Controls International, Inc. 1994; All Rights Reserved
Note
Ensure that the packing box parts are assembled in the correct order . Packing parts
can not function properly if the Belleville
springs or other packing parts are not
stacked correctly.
3. Use the drawing provided to ensure that the packing
parts are assembled in the correct order. Install the
ENVIRO-SEAL packing parts into the packing box.
4. For 72 spring construction:
Note
For valves with a new spring pack assembly
(key 217), the springs are tight on the packing flange. When the spring pack assembly
is removed from the valve after being in service for some period of time, the springs
may be loosened within the spring pack assembly. This is not an indication of defective springs, but that the springs have “set”
in the operating position.
Install the spring pack assembly (key 217), which includes
the attached springs and packing flange, onto the stem.
Install the nuts (key 212), and hand tighten them.
5. For 7, 9, & 10 spring construction:
Install the spring pack assembly (key 217), with the attached
springs, onto the stem. Install the packing flange (key 201)
and the packing box nuts (key 212). Hand tighten them.
Note
Lubrication is required for the packing studs
and nuts. A lthough i t is i mportant to properly
lubricate the stud threads and internal nut
threads, it is also important to properly lubricate the contacting face of the nut.
6. You will obtain maximum benefit from your ENVIROSEAL packing system when you tighten the packing flange
nuts and compress the Belleville springs to their ‘‘target
load.’’ The target load is the point where the Belleville
springs are designed for optimum performance, when they
are compressed to 85% of their maximum deflection, or
nearly flat. (Maximum deflection is when the springs are
100% compressed, or completely flat.)
To obtain the target load of 85% compression of maximum
deflection, perform the following:
D Tighten the packing flange nuts alternately and evenly, keeping the packing flange parallel with the valve flange,
until the Belleville springs are compressed 100% (or completely flat). Refer to the instruction manual for ENVIROSEAL packing systems for sliding stem valves if you need
further assistance.
D300895X012 5/94
Installation Instructions
Design GL ENVIRO-SEALtPTFE Packing
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D For PTFE packing, loosen each packing flange nut
1/2 turn (180 degrees rotation).
The ‘‘target load’’ of 85% compression has now been
reached.
7. Refer to the appropriate valve and actuator instruction
manuals when connecting the valve to the actuator. Under
normal conditions, the packing nuts should not require retightening.
PACKING RETROFIT PACKING REPAIR STEM SIZE
RGLXPKRT062 RGLXPACK012 12 mm (.472 in)
For additional information concerning the installation of this packing kit, please consult the appropriate Fisher Controls product instruction manual.
PACKING STUD, QTY 2
(KEY 200)
PACKING NUT, QTY 2
(KEY 212)
PACKING FLANGE
(KEY 201)
SPRING PACK ASSEMBLY
(KEY 217)
PACKING SET, QTY 2
(KEY 215)
ANTI-EXTRUSION
WASHER, QTY 4 (KEY 214)
PACKING BOX BUSHING
(KEY 6)
33B0318-B
LANTERN RING
(KEY 216)
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.
While this information is presented in good faith and believed to be accurate,
Fisher Controls does not guarantee satisfactory results from reliance upon such
information. Nothing contained herein is to be construed as a warranty or guar-
antee, express or implied, regarding the performance, merchantability, fitness
or any other matter with respect to the products, nor as a recommendation to
use any product or process in conflict with any patent. Fisher Controls reserves
the right, without notice, to alter or improve the designs or specifications of the
products described herein.
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Printed in U.S.A.
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Fisher Controls
For information, contact Fisher Controls:
Marshalltown, Iowa 50158 USA Sao Paulo 05424 Brazil
Cernay 68700 France Singapore 2158
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