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DESCRIPTION The VC-230A direct-acting model and the VC-231A reverse-acting model are spring opposed diaphragm actuators. They are designed to provide dependable On-Off or throttling operation of control valves. They may be actuated by pneumatic signals from any suitable temperature or pressure controller.
Model VC-230A - Air pressure from the controller is applied to the top of the diaphragm. As this pressure increases within the range of the load spring, the actuator stem moves down. Model VC-231A - Air pressure form the controller is applied underneath the diaphragm. Increasing pressure causes the actuator stem to move upward.