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Gate valve principle of the structure
Gate valve opening and closing pieces is the gate, the direction of movement of the gate and fluid perpendicular to the gate valve can only be fully open and fully closed, can not be adjusted and throttling. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valves form a wedge. The wedge angle varies from valve to valve, typically 50, with a 2 ° 52 'medium temperature. Wedge gate valve gate can be made as a whole, called the rigid gate; can also be made to produce a slight deformation of the gate, to improve its technology to make up for sealing surface angle in the process of deviation, this gate The board is called a flexible gate. Gate valve type, according to the sealing surface can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate type, double gate type, air trap and elastic gate type; parallel brake Plate gate valve can be divided into single and double gate type. According to the thread position of the stem division, can be divided into Ming rod valve and dark rod gate valve two. Gate valve is closed, the sealing surface can only rely on medium pressure to seal, that is, rely on media pressure to the sealing surface of the gate pressure to the other side of the valve seat to ensure that the sealing surface of the seal, which is self-sealing. Most of the gate valve is forced 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. More Search Keywords: Gate valve