This kind of valve is mounted outside of the bottom wall of various precipitation pools to remove the mud sand and dirt on the bottom of the pool.
This valve consists of a hydraulic cylinder and an angular stop valve by way of combining the internal power of the hydraulic cylinder to drive the disc to go up and down to have the body's path open or close so as to have the fluids pass or stop.
The sealing part of the piston of the hydraulic cylinder is an L-type leather cup, good tightness and durability. Both disc and seat ring are soft seal, well sealed without leakage. Use a collective control with an electric or manual two-place four-way reversal valve, easy operation.