... 5. Actuator & Accessory FunctionDouble - acting pneumatic actuator;Double position control of valve's open or close Spring Return: ... power on , vice versa(explosion-proof offer available) Double-control solenoid valve: Valve opens when one coil is power ... Acting ,(3) Model2). Solenoid Valve, (1) Single-Control Solenoid Valve ,(2) Double-Control Solenoid Valve ,(3) Voltage ,(4) Explosion-Proof Type3 ...