Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
6
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 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
on both sides of the valve. Drain the process media from both sides of the valve.
D Vent the pneumatic 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
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.
Packing Lubrication
Note
ENVIRO-SEAL and HIGH-SEAL packing do not require lubrication.
WARNING
To avoid personal injury or property damage resulting from fire or explosion, do not lubricate packing used in oxygen
service or in processes with temperatures over 260_C (500_F).
If a lubricator or lubricator/isolating valve is provided for PTFE/composition or other packings that require lubrication,
it will be installed in place of the pipe plug (key 46). Use a good quality silicon‐base lubricant. To operate the lubricator,
simply turn the cap screw clockwise to force the lubricant into the packing box. The lubricator/isolating valve operates
the same way except open the isolating valve before turning the cap screw and then close the isolating valve after
lubrication is completed.
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