Knife gate valve, also known as knife gate valve, knife-type slurry valves, gate opening and closing parts of its direction of motion of the fluid direction perpendicular to the gate, can be cut by the blade-shaped gate dielectric fiber material to cut, Ram has two sealing surface, the two most common mode of sealing surface to form a wedge gate valve, wedge angle with the valve parameters vary, usually 50, wedge type knife gate valve can be made ​​into a whole, called the rigid gate ; also made ​​to produce micro deformation gate to improve its process, to make the sealing surface angle deviation generated in the process, this gate is called the flexible gate. Valve chamber does not actually exist, lift gate on the side of the guide groove by convex ear pressed against the bottom of the seat, when reaching a higher media For sealing O-ring seal seat can be used to achieve bi-directional sealing. Knife gate valve has a smaller installation space, work pressure is low, easy accumulation of debris, lower prices.

When knife gate valve is closed, the sealing surface can only rely on media pressure to seal, that the medium pressure to ram pressure to the sealing surface of the valve seat on the other side to ensure the sealing surface, which is self-sealing. Most knife valve is sealed by force, that is when the valve is closed, to rely on external pressure to force the gate valve to ensure that the sealing of the sealing surface. This type valve in the pipe should generally be installed horizontally.

 Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve