EH Valves (NPS 8 through 14)
Instruction Manual
April 2009
5
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.
WARNING
Refer to table 4 for valve assembly
weights and the appropriate actuator
instruction manual for actuator
assembly weights. Due to the size and
weight of the valve and actuator
assembly, be sure adequately sized
hoists and chains or slings are used to
handle it. Also, take proper
precautions to prevent personnel from
being injured if the hoist or rigging
slips unexpectedly.
Note
Whenever a gasket seal is disturbed
by removing or shifting gasketed
parts, install a new gasket upon
reassembly. This is necessary to
ensure a good gasket seal.
8. After all maintenance is complete, refer to the
Trim Replacement procedure to assemble the valve
body.
Note
If the valve has ENVIRO-SEAL
r
live-loaded packing installed, see the
Fisher instruction manual titled
ENVIRO-SEAL Packing System for
Figure 2. Lubricator and Lubricator/Isolating Valve
LUBRICATOR
LUBRICATOR/ISOLATING VALVE
10A9421-A
AJ5428-D
A0832-2/IL
14
14
27
Sliding-Stem Valves for packing
instructions.
If the valve has HIGH-SEAL live-loaded
packing installed, see the Fisher
instruction manual titled HIGH-SEAL
Live-Loaded Packing System for
instructions.
Packing Lubrication
WARNING
To avoid personal injury or property
damage resulting from fire or
explosion, do not lubricate packing
used in oxygen service or in
processes with temperatures over
260
_
C (500
_
F).
Note
ENVIRO-SEAL or HIGH-SEAL packing
does not require lubrication.
A lubricator or lubricator/isolating valve (figure 2) is
recommended for PTFE-impregnated composition
packing. The lubricator or lubricator/isolating valve is
installed in place of the pipe plug in the bonnet. Use
a good quality silicon-base lubricant. Do not lubricate
packing used in oxygen service or in processes with
temperatures over 260
_
C (500
_
F). To operate the
lubricator, turn the cap screw clockwise to force
lubricant into the packing box. The