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Instruction Manual

D103312X012

GX 3-Way Valve and Actuator

August 2011

Figure 2. Fisher GX 3-Way Nameplate (Key 35)

GE35409-C

GG12218-A

ELECTRIC ACTUATOR

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 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 i s 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 all three inlets/outlet 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 Uselock-outprocedurestobesurethattheabovemeasures 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. P rocess 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.

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