Instruction Manual
D103312X012
GX 3-Way Valve and Actuator
July 2017
3
WARNING
If you move or work on an actuator installed on a valve with loading pressure applied, keep your hands and tools away from
the stem travel path to avoid personal injury. Be especially 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.
Figure 2. Fisher GX 3‐Way Nameplate (Key 35)
GG12218-A
ELECTRIC ACTUATOR
GE35409-D
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
or Local Business Partner. Flow through the valve must be in the
direction indicated by the flow arrow nameplate on the valve. See figures 3 and 4.
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.