The opening and closing part of the gate valve is the gate plate, the direction of motion of the gate plate is perpendicular to the direction of the fluid, the gate valve can only be fully opened and fully closed, and can not be adjusted and throttled. The two sealing faces of the most commonly used mode gate valve form a wedge, and the wedge Angle varies with the valve parameters, usually 5°, and 2°52' when the medium temperature is not high. The gate plate of the wedge valve can be made into a whole, which is called the rigid gate plate; It can also be made to produce a micro deformation of the ram, in order to improve its processability, make up for the sealing surface Angle in the processing of the deviation, this ram is called elastic ram. When the gate valve is closed, the sealing surface can be sealed only by relying on the medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate plate to the seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forced to seal, that is, when the valve is closed, it is necessary to rely on external forces to force the gate to the seat to ensure the tightness of the sealing surface

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