2/2-way external control valves are available from Air & Hydraulic Systems .
At rest, the external control valves are closed by spring-force and medium pressure.
When the actuator is pressurised, it lifts the piston and the valve plate simultaneously to open the valve.
2/2-way external control valves feature Class A mechanical strength and leak tightness according to valve group 2.
After the switch of the control valve (3/2-way solenoid valve), the actuator will be pressed on the valve seat by the close force of the pressure spring with the valve plate, depending on the size of the automatically shut-off valve within the specified closing time of <= 1 second, sealing the gas flow hermetically.