This product is an angle-type shut-off valve actuated by a hydraulic or pneumatic source. It is usually installed in rows on the outer wall at the bottom of sedimentation tanks to remove sand and sludge deposited at the bottom of the tank. The valve is divided into two chambers by a nylon-reinforced rubber diaphragm. By connecting the hydraulic or pneumatic source and controlling it with an electric or manual 4/2-way directional valve, rapid sludge discharge is achieved. This valve replaces the