The electro-pneumatic control valve is used primarily as the actuator in a level or flow rate control loop.
The control valve is installed and connected to the test stand for control valves, RT 390. An electrical signal input (identical to the controller output) is pre-configured and routed to the base module terminal array which is specific to the particular application.
The control valve is fitted with an electro-pneumatic positioner which requires a supply of compressed air. The valve rod is driven by a pneumatically operated membrane. The electro-pneumatic control valve is set to the safe “closed” position when no auxiliary power is applied.