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What is the Principle of Operation of a Control Valve?
- Aug 30, 2018 -

The control valve features an actuator that is mounted on the valve. The valve usually modulates the flow of the fluid through the movement of the valve plug. This valve plug is attached to a valve stem that is connected to the actuator. This actuator is electrically or pneumatically operated, and it directs the stem movement as dictated by the control device, located externally.

  • Electric Actuators: Driven by motors, these systems utilize an electric input signal to stir the rotation of the motor shaft. This rotation is translated into a linear motion, which drives the plug assembly, as well as the valve stem for the flow modulation.

  • Pneumatic Actuators: These actuators create a modulating control action by utilizing a air signal from the external control device. The air signal is received into the actuator through a port, and it is distributed across the actuators diaphragm. This diaphragm creates pressure on the spring return assembly, as well as the diaphragm plate, which stirs the downward motion of the plug assembly and the valve stem, and strokes the valve.