Instruction Manual
D103175X012
GX Valve and Actuator
April 2011
4
4. If continuous operation is required during inspection or maintenance, install isolating valves on either side of the
control valve with a bypass valve to control the flow while the control valve is receiving maintenance.
WARNING
Personal injury could result from packing leakage. Valve packing is tightened before shipment; however the packing might
require some readjustment to meet specific service conditions.
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 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 the process pressure. Relieve the process
pressure from both sides of the valve.
D Depending on the actuator construction, it will be necessary to manage the pneumatic actuator loading pressure and
any actuator spring pre‐compression. It is essential to refer to the relevant actuator instructions in this manual to
ensure safe removal of the actuator from the valve.
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, install a new gasket during reassembly. This ensures a
good gasket seal because the used gasket may not seal properly.
Actuator Maintenance
The following sections provide procedures for actuator maintenance. Refer to figures 18, 19, 20, and 21.
The actuator soft parts may require periodic replacement. This includes the diaphragm (key 10), actuator rod bushing
(key 19), and the actuator rod seal (key 20).
If the actuator stroking direction (air‐to‐open or air‐to‐close) is unknown, refer to the nameplate on top of the
actuator casing and figure 2.
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