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, and the gate valve can only be fully opened and fully closed, and can not be adjusted and throttled. The ram has two sealing faces, the most commonly used mode of the two sealing faces of the ram valve form a wedge, and the wedge Angle varies with the valve parameters. 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.

The type of gate valve, national standard gate valve, cast steel gate valve, according to the sealing surface configuration can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate type, double gate type and elastic gate type; Parallel gate valves can be divided into single and double gate valves. According to the thread position of the valve stem, it can be divided into two kinds: open stem gate valve and dark stem gate valve.

When the gate valve is closed, the sealing surface can only be sealed by the medium pressure, that is, the sealing surface of the gate plate can be pressed to the seat on the other side by the medium pressure 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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