ET Valve
Instruction Manual
Form 5081
June 2002
4
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.
Valves with ENVIRO-SEAL live-loaded packing or
HIGH-SEAL
live-loaded packing will not require
this initial readjustment. See the Fisher instruction
manuals, ENVIRO-SEAL Packing System for
Sliding-Stem Valves or HIGH-SEAL Live-Loaded
Packing System (as appropriate), for packing
instructions. If you wish to convert your present
packing arrangement to ENVIRO-SEAL packing,
refer to the retrofit kits listed in the Parts Kits section.
Maintenance
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 lubrication, packing
maintenance, trim maintenance, and ENVIRO-SEAL
bellows seal bonnet replacement. All maintenance
operations may be performed with the valve in the
line.
WARNING
Avoid personal injury or property
damage from sudden release of
process pressure or bursting of parts.
Before performing any maintenance
operations:
Always wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations to avoid personal injury.
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.
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.
Vent the pneumatic actuator
loading pressure and relieve any
actuator spring precompression.
Use lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
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.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
Note
Whenever a gasket seal is disturbed
by removing or shifting gasketed
parts, install a new gasket during
reassembly. This ensures a good
gasket seal because the used gasket
may not seal properly.
Packing Lubrication
Note
ENVIRO-SEAL and HIGH-SEAL
packing do not require lubrication.
If a lubricator or lubricator/isolating valve (figure 2) is
provided for PTFE/composition or other packings
that require lubrication, it will be installed in place of
the pipe plug (key 14, figure 14). 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,
simply turn the cap screw clockwise to force the
lubricant into the packing box. The
lubricator/isolating valve operates the same way
except open the isolating valve before turning the
cap screw and then close the isolating valve after
lubrication is completed.