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Control Valve Actuator Bench-set and Valve Stroking

Actuator Bench-set

An actuator bench-set is the instrument air pressure required to begin moving the stem against its closure spring and to fully stroke the actuator over its entire range. These settings are applied by adjusting the spring compression to compensate for the process pressures that will act on the plug area. This setting is typically performed on the actuator before it is mounted onto the valve. The graph below shows the bench-set response of an actuator.

Actuator Bench-set Response Graph

The diagram above is for a direct acting, ATC – FO (air-to-close, fail open) control valve with a signal of 3psig signifying a fully open valve and 15psig a fully closed valve.

Valve Stroking

All control valves after being in service for some time requires stroking. This is because, the valve is a mechanical device with physical components that should be

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