FIELD: filtering. SUBSTANCE: upper lid of sealed tank of the device is provided with fastened suction pipe branch. Sliding sleeve with upper outer radial shoulder is put on the pipe branch. Lower part of the shoulder is processed for a valve plate interacting with a valve seat coaxial to the suction pipe branch. A ring gap is provided between seat opening and outer diameter of the sleeve. Suction valve has outer U-shaped flange with radial holes on the upper part of the pipe branch. EFFECT: high efficiency. 1 dwg
