Maintenance - Fisher HPA Instruction Manual

HP and HPA Valves
July 2017
4. Use accepted piping and welding practices when installing the valve in the pipeline. For flanged valve bodies, use a
suitable gasket between the body and pipeline flanges.
5. Install a three‐valve bypass around the valve if continuous operation is required during maintenance.
6. If the actuator and valve body are shipped separately, refer to the actuator mounting procedure in the appropriate
actuator instruction manual.
7. 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‐SEAL
re‐adjustment. See the 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. 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. Inspection and maintenance
frequency depends on the severity of service conditions. This section includes instructions for packing lubrication,
packing maintenance, and trim maintenance. All maintenance operations may be performed with the valve in the line.
WARNING
Avoid personal injury or damage to property from sudden release of pressure or uncontrolled process fluid. Before starting
disassembly:
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.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Note
The HP series valve uses spiral‐wound gaskets which are crushed to provide their seal. A spiral‐wound gasket should never be
reused. Whenever a gasket seal is disturbed by removing or shifting gasketed parts, a new gasket must be installed upon
reassembly. This is necessary to ensure a good gasket seal, since the used gasket will not seal properly.
6
live‐loaded packing or HIGH‐SEAL ULF live‐loaded packing will not require this initial
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Instruction Manual
D101634X012