EDR and ETR Valves
Instruction Manual
Form 5050
August 2006
4
Shrunk-fit pieces and threaded
connections may loosen. In general, if
post weld heat treating is to be
performed, all trim parts should be
removed. Contact your Emerson
Process Management sales office for
additional information.
5. If continuous operation is required during
inspection or maintenance, install a three-valve
bypass around the control valve assembly.
6. If the actuator and valve are shipped separately,
refer to the actuator mounting procedure in the
appropriate actuator instruction manual and also see
figure 2.
WARNING
Personal injury could result from
packing leakage. Valve packing was
tightened prior to shipment; however
some readjustment will be required to
meet specific service conditions.
Maintenance
WARNING
Avoid personal injury from sudden
release of process pressure. Before
performing any maintenance
operations:
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.
D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
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 trim maintenance, packing
maintenance, and packing lubrication. All
maintenance operations may be performed with the
valve installed in the pipeline.
Note
If the valve has ENVIRO-SEALr
live-loaded packing installed (figure 9,
10, or 11), see the Fisher instruction
manual entitled ENVIRO-SEAL Packing
System for Sliding-Stem Valves for
packing instructions.
If the valve has HIGH-SEALt
Heavy-Duty live-loaded packing
installed (figure 8), see the Fisher
instruction manual entitled HIGH-SEAL
Live-Loaded Packing System for
packing instructions.
Trim Maintenance
Disassembly
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.
Key number locations are shown in figure 12 or 13
unless otherwise indicated.
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