Instruction Manual
D103175X012
GX Valve and Actuator
July 2017
4
If hoisting the valve take care to prevent people from being injured in case the hoist or rigging slips. Be sure to use
adequately sized hoists and chains or slings to handle the valve.
1. Before installing the valve, inspect it to be certain that the valve body cavity is free of all foreign material. Clean out
all pipelines to remove scale, welding slag and other foreign material.
2. The control valve assembly may be installed in any orientation unless limited by seismic criteria. However, the
normal method is with the actuator vertical above the valve. Other positions may result in uneven trim wear, and
improper operation. With some valves, the actuator may also need to be supported when it is not vertical. For more
information, consult your Emerson sales office
or Local Business Partner. Flow through the valve must be in the
direction indicated by the arrow cast on the valve.
3. Use accepted piping practices when installing the valve in the pipeline. Use a suitable gasket between the valve and
the pipeline flanges.
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.
To Next Page
Loading...
Need help?
General
