Generally speaking, the common hoist is spillway, and the gate is usually put down and only opened when the flood is discharged. Therefore, when the electromagnet at the left end of the reversing valve is energized, the pressure oil of the pumping station is fed from the piston rod end, which pushes the oil cylinder to contract and pulls the gate upward, that is, opens the gate; The electromagnet at the right end is energized, and the reversing valve reverses direction. The pressure oil in the pumping station feeds from the bottom of the oil cylinder, pushes out the oil cylinder, and presses down the ram, that is, closes the ram.

Because the schematic diagram of various hoists will be different, the action of solenoid valve can only be known by comparing with the hydraulic schematic diagram. Never copy mechanically.