Summary
Typically, a four-way solenoid valve is used to operate the double-acting cylinder.
Mainly, there are five pipe connecting port, four-way solenoid valve, has become a place 2 1 inlet, 2 outlet, outlet. Because it is always closed, the exhaust port is one of the four direction any functionality.
Single solenoid and has one coil inside, switched switched to its original state, flow direction when the solenoid is energized from a power outage and blackout state.