SUCTION CHECK VALVE USED IN FIELD OF WATERWAY

摘要

Provided is a suction check valve used in the field of waterway, which comprises a main body and an elastic seal sleeve (100). A waterway and at least one air inlet aperture are provided in the main body. The waterway is provided with a water inlet aperture (340) and a mutation cavity (350) communicated with the water inlet aperture (340). The section area of the mutation cavity (350) is larger than that of the water inlet aperture (340). The air inlet aperture has an air inlet located outside the main body and an air outlet located in the mutation cavity (350). The elastic seal sleeve (100) is installed in the main body and adapted to the air inlet aperture of the main body. When the water in waterway flows forward, negative pressure is generated in the mutation cavity (350) and the elastic seal sleeve (100) are absorbed so that the air inlet aperture is opened so as to suck air. When the water in waterway flows backward, hydraulic pressure in the waterway acts on an inner surface of the elastic seal sleeve (100) such that the elastic seal sleeve (100) seals the air inlet aperture.