Maintenance - Fisher EUT-2 Instruction Manual

EU and EW Series Valves

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, lapping seating
surfaces, and valve plug maintenance. All
maintenance operations may be performed with the
valve in the line.
WARNING
Avoid personal injury from sudden
release of process pressure. 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 on 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.
6
LUBRICATOR
10A9421-A
AJ5428-D
LUBRICATOR/ISOLATING VALVE
A0832-2/IL
Figure 3. Lubricator and Lubricator/Isolating Valve
D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
1. Isolate the control valve from the line pressure,
release pressure from both sides of the valve body,
and drain the process media from both sides of the
valve. If using a power actuator, also shut off all
pressure lines to the power actuator, release all
pressure from the actuator, and use lock-out
procedures to prevent injury while you work on the
equipment.
Whenever a gasket seal is disturbed
by removing or shifting gasketed
parts, a new gasket should be installed
upon reassembly. This is necessary to
ensure a good gasket seal because the
used gasket might not seal properly.
If the valve has ENVIRO-SEAL
live-loaded packing or HIGH-SEAL ULF
live-loaded packing installed, see the
Fisher instruction manuals titled
ENVIRO-SEAL Packing System for
Sliding-Stem Valves (D101642X012) or
HIGH-SEAL ULF Live-Loaded Packing
System (D101453X012) (as
appropriate) for packing instructions.
Instruction Manual
August 2010
31
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Note