Gate Valve is generally used to connect or disconnect the line of medium, its down part (disc) or down to move within the plane perpendicular to the centerline of the valve channel. The gate valve can not be used as regulating the flow of media.

   Gate valve main characteristics: the fluid resistance is small; the direction of media flow unrestricted. Dimensions of gate valve and opening height, the required installation space, opening and closing a long time; in the opening and closing process, the sealing surface is easy to produce scratches, wear larger; manufacturing and maintenance difficult.

   Gate valve closed parts of the structure is divided into a wedge gate valve, resilient seated gate valves and flat gate; gate according to the stem structure, but also into the next shot (lifter) and dark bar (rotating rod) valve.

   Wedge gate valve can be divided into a single gate and double plate. A single gate can be divided into rigid single-gate and flexible single gate. High temperature and high pressure wedge gate valve in the chamber joins the general structure of the self-sealing. It can effectively prevent the high temperature and pressure and temperature and pressure alternating valve flange seal failure. The soft sealing gate valve extrusion seals rely on the gate surface-coated rubber and body contact. Ram overall rubber coated to avoid corrosion of the media on the gate, to improve the corrosion resistance of the valve.

   closure is a parallel gate. Flat gate valve flow resistance is smaller, similar to the flow resistance and the straight pipe flow resistance. Parallel to the gate can be divided into a single gate and double plate with distraction institutions. Parallel to the gate, including a knife-shaped flat gate valve, flat gate deflector plate gate valve without diversion hole. However, at high, if the sealing surface without media lubrication, frequent opening and closing may cause the sealing surface wear. At the same time cut off the flow of high speed and high-density media, will have a severe vibration. The general single-gate flat gate valve seat is axial floating, self-sealing structure rely on spring preload of the valve seal, the sealing surface is not easy to damage the valve by the hot and cold alternating. The valve is equipped with automatically injected into sealed lipid bodies, the failure of the sealing surface to sealing surface into sealing grease for short-term seals. Fill part can also set the seal fat bodies.