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Instruction Manual

February 2009

GX Control Valve and Actuator System - 14722 GX Valve and Actuator

GE01296-G

WARNING

Personal injury could result frompacking leakage. Valve packing is tightened before shipment; howeverthe packing might require somereadjustment to meet specific service conditions.

Maintenance

GE01296-99

WARNING

WITH SPRING INFORMATION WITHOUT SPRING INFORMATION Figure 2. Fisher GX Nameplate Examples Avoid personal injury or propertydamage from sudden release ofprocess pressure or bursting of parts. Before performing any maintenanceoperations: avoid personal injury. Be especiallycareful when removing the stem connector to release all loading on theactuator stem whether it be from airpressure on the diaphragm or compression in the actuator springs.Likewise take similar care whenadjusting or removing any optional travel stop. Refer to the relevantactuator Maintenance Instructions.If hoisting the valve take care toprevent people from being injured incase the hoist or rigging slips. Be sure to use adequately sized hoists andchains or slings to handle the valve. Do not remove the actuator fromthe valve while the valve is stillpressurized. Always wear protective gloves,clothing, and eyewear whenperforming any maintenanceoperations to avoid personal injury. 1. Before installing the valve, inspect it to be certainthat 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 inany orientation unless limited by seismic criteria. However, the normal method is with the actuatorvertical above the valve. Flow through the valvemust be in the direction indicated by the arrow cast on the valve. 3. Use accepted piping practices when installing thevalve in the pipeline. Use a suitable gasket betweenthe valve and the pipeline flanges.4. If continuous operation is required duringinspection or maintenance, install isolating valves oneither side of the control valve with a bypass valve to control the flow while the control valve is receivingmaintenance. Disconnect any operating linesproviding air pressure, electric poweror a control signal to the actuator. Be sure the actuator cannot suddenlyopen or close the valve. Use bypass valves or completelyshut off the process to isolate thevalve from the process pressure.Relieve the process pressure from both sides of the valve. Depending on the actuatorconstruction, it will be necessary to manage the pneumatic actuatorloading pressure and any actuatorspring pre-compression. It is essential to refer to the relevant actuator
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