Process control valves function in a variety of ways to control manufacturing processes, but all process control valves require some sort of actuator -- either hydraulic, pneumatic or electric -- to open the valve as part of the control valve assembly which also includes the positioner, air sets, transducer and limit sets. A signal is sent from the operator or process monitor to activate the actuator which opens the valve, allowing a measured amount of liquid or gas to escape, bringing the process back to equilibrium.

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2012-08-22

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