Importance

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Abstract

A fluid control system is provided for controlling flow of a process fluid through a pipeline. The fluid control system can include a valve arranged to control a flow of process fluid, an actuator configured to adjust a position of the valve, and a controller configured to control movement of the actuator. The system may include a switching valve in communication with the actuator and the controller. Further, a solenoid valve may be in communication with a first port of the switching valve. In one example, depending on pressure at the first port of the switching valve, the switching valve is operable in a first state to provide process fluid to the valve controller and permit movement of the actuator and in a second state to block flow of process fluid to the valve controller and block flow of process fluid from the pneumatic actuator.

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First Claim