Namur Solenoid Valves Direct Mount to Valve Actuators. Double Acting Air Actuators use 4-Way Namur Solenoid Valves and Spring Return Air Actuators use 3-Way Solenoids. You can also use 4-Way Solenoid Valves for Spring Return Air Actuators as the Air will Assist the Spring on the Spring Return Stroke of the Actuator. You may want to consider how you want the solenoid valve to fail before doing this with your application.
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Namur Solenoid Valve Direct Mounts to Valve Actuator. Namur solenoid coil engages shuttle valve to allow air to inflate and exhaust valve actuator. 3-Way Namur Solenoid Valves have 4 ports and are sometimes called 4 way solenoid valves. 4-way solenoid valves have 5 ports and are sometimes called 5 way solenoid valves.