The shut-off valve, also called the door, is the most widely used type of valve. It is popular because of the small friction between the sealing surfaces during the opening and closing process. It is relatively durable, the opening height is not large, and the manufacturing is easy. Convenient, not only for medium and low pressure, but also for high pressure.
The closing principle of the shut-off valve is that, relying on the pressure of the valve bar, the sealing surface of the valve disc and the sealing surface of the valve seat are closely fitted to prevent the medium from flowing.
The shut-off valve allows only one-way flow of the medium and is directional when installed. The structural length of the shut-off valve is larger than that of the gate valve, and the fluid resistance is large. When the machine is operated for a long time, the sealing reliability is not strong.
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