Structural principle of gate valve（1）

The opening and closing component of a gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, and 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 5 °, and 2 ° 52 'when the medium temperature is not high.When the gate valve is closed, the sealing surface can be sealed solely by relying on the medium pressure, that is, the sealing surface of the gate plate can be pressed 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.