Solenoid valves convert electrical energy to mechanical energy, which causes a magnetic response. The solenoid activates when an electrical current comes through the wire coil. When activated, solenoids in hydraulic valves and pneumatic valves control the flow of fluid when a fluid power system is in motion. You can rest assured to buy Switch Air Pneumatic Mechanical Control Valve from our factory, and we will offer you the best after-sale service and timely delivery.