Manual knife gate valve application and structural features as follows a brief introduction: Manual knife gate valve can only be fully open and fully closed, can not be adjusted and throttling. The gate has two sealing surfaces. The two most commonly used gate valves are wedge-shaped. The wedge angle varies with the valve parameters, typically 50, and the gate of the wedge gate valve can be made in one piece and called Rigid gate; can also be made to produce a small amount of deformation of the gate, to improve its technology to make up for sealing surface angle in the process of deviation, this gate is called elastic gate knife gate valve closed, the sealing surface Can rely only on the media pressure to seal, that is, rely on the media pressure to the pressure on the other side of the valve seat seal to ensure that the sealing surface sealing, which is self-sealing. Most knife-type gate valve is a mandatory seal, that is, when the valve is closed, it must rely on external force to force the gate to the valve seat to ensure the sealing surface of the seal.