QY Series is buried in valve’ body and completely isolated from the outside environment, it is suitable for installed with sewage pipes and keeps the valve body immersed in the liquid, if the gate is not isolated from the external environment, then the gate will soon be corrupted and influence its serving life. The sealing structure is that when knife is moving downward, its edge will press the wedge block and ensure the knife will be closed combined with seat seal, so as to achieve a sealing effect.
