The opening and closing component of the gate valve is the gate, and the direction of the gate's movement is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed!

Gate valves cannot be adjusted or throttled. The gate has two sealing surfaces, and the most commonly used mode is that the two sealing surfaces of the gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50, and is 2 ° 52 'when the medium temperature is not high. The gate plate of the wedge gate valve can be made into a whole, called a rigid gate plate; It can also be made into a gate that can produce slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate.

According to the sealing surface configuration, it can be divided into wedge gate valve and parallel gate valve. Wedge gate valve can be further divided into single gate pole type, double gate plate type, and elastic gate plate type; Parallel gate valves can be divided into single gate and double gate types. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valves and non rising stem gate valves.
When the gate valve is closed, the sealing surface can rely solely on the medium pressure to seal, that is, relying on the medium pressure to press the sealing surface of the gate plate towards the other side of the valve seat to ensure the sealing of the sealing surface, which is self sealing. Most gate valves adopt forced sealing, which means that when the valve is closed, external force must be used to forcefully press the gate plate towards the valve seat to ensure the sealing of the sealing surface.