Maintenance; Packing Maintenance - Fisher CV500 Instruction Manual

CV500 Valve
June 2017
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. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.
If the valve has ENVIRO‐SEAL
instruction manual titled Fisher ENVIRO‐SEAL Packing System for Rotary Valves (D101643X012) 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

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 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 Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D The valve packing area 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.
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. The frequency of inspection
and replacement depends upon the severity of service conditions.

Packing Maintenance

Key numbers refer to figure 9 for NPS 3 through 8 and to figure 10 for NPS 10 and 12 unless otherwise indicated.
Note
For the ENVIRO‐SEAL packing system, refer to the Parts List section for retrofit kits, parts kits, and individual parts (see figures 11
and 12). Refer to separate ENVIRO‐SEAL instruction manual (D101643X012) for maintenance instructions.
Standard ENVIRO‐SEAL packing systems can be used in vacuum service with packing rings in the standard orientation. It is not
necessary to reverse the ENVIRO‐SEAL PTFE packing rings.
8
™
live‐loaded packing installed, readjustment will probably not be required. See the
Instruction Manual
D101640X012