A 5/2 single solenoid spring return valve is a type of standard mechanical valve that, when activated under electrical power, opens under positive air pressure. In standard industrial applications, they have been used to actuate double acting pneumatic actuators, such as cylinders, grippers and rotator actuators. Also Namur type of solenoid valves are available, they are directly mounted to pneumatic actuator inlet/outlet ports. And mainly have their application in process industry.