GX Valve and Actuator
Instruction Manual
Form 5770
June 2006
3
Figure 2. Design GX Nameplate Examples
GE01296-E
AIR-TO-CLOSE (SPRING-TO-OPEN)
WITH EQUAL PERCENTAGE TRIM
AIR-TO-OPEN (SPRING-TO-CLOSE)
WITH LINEAR TRIM
careful when removing the stem
connector to release all loading on the
actuator stem whether it be from air
pressure on the diaphragm or
compression in the actuator springs.
Likewise take similar care when
adjusting or removing any optional
travel stop. Refer to the relevant
actuator Maintenance Instructions.
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. 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
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.
