Maintenance - Fisher 461 Instruction Manual

Instruction Manual
D100714X012
4. Do not install the valve in a system where the service conditions exceed those specified when the valve was
ordered.
5. If continuous operation is required during maintenance and inspection, install a three-valve bypass around the valve
body so that it will be isolated.
6. Orient the valve body so that the flow will be in the direction indicated by the flow direction arrow located on the
outside of the valve body to ensure proper self-cleaning action.
7. If the actuator and valve are shipped separately, refer to the actuator mounting procedure outlined in the
appropriate actuator instruction manual.
8. If the valve body was shipped without packing installed in the packing box, install the packing before putting the
valve body into service. Refer to instructions given in the Packing Maintenance procedure.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the packing
might require some readjustment to meet specific service conditions.
Valves with ENVIRO‐SEALt live‐loaded packing or HIGH‐SEAL Heavy‐Duty live‐loaded packing will not require this
initial re‐adjustment. See the instruction manuals titled ENVIRO‐SEAL Packing System for Sliding‐Stem Valves,
D101642X012, or HIGH‐SEAL Live‐Loaded Packing System, D101453X012, (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 kit sub‐section near the end of this manual.

Maintenance

Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. 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
from 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.
461 Valve
June 2017
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