The opening and closing parts of the gate valve are the gate, the movement direction of the gate is perpendicular to the direction of the fluid, and the gate valve can only be fully open and full off, and can not be adjusted and throttling. The gate has two sealing surfaces, and the two sealing surfaces of the most commonly used mode gate valves form wedges, wedge angles vary with valve parameters, usually 5 °, and 2°52 when the medium temperature is not high. The gate of the Wedge gate valve can be made into a whole, called rigid gate, and can also be made into a gate that can produce trace deformation to improve its processability and make up for the deviation of the sealing surface angle during processing, which is called the Elastic Gate plate. When the gate valve is closed, the sealing surface can be sealed only by the dielectric pressure, that is, relying on the dielectric pressure to press the sealing surface of the gate to the other side of the seat to ensure the sealing of the sealing surface, which is self-sealing.
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