Stop Valve, also known as Jummen, is one of the most widely used valves, it is widely popular, because of the opening and closing process between the sealing surface friction small, more durable, open high, easy to manufacture, easy to maintain, not only applicable to the medium and low pressure, but also applicable to high pressure. Closing valve closed principle is to rely on the pressure of the valve, so that the disc sealing surface and valve seat sealing surface closely fit to prevent media circulation. China's valve "three to" has stipulated that the flow of the cut-off valve, all the use of Top-down, so the installation has directional. The structure length of the cut-off valve is larger than the gate valve, while the fluid resistance is large and the sealing reliability is not strong in the long run.
As one of the most important truncation valves, the cut-off valve plays an important role in the field of aerospace. As an important component of space equipment, the cut-off valve realizes the functions of medium conveying, cut-off and regulation, and its sealing performance directly affects the safe and reliable operation of the space equipment. This paper studies the influencing factors and influence rules of the sealing characteristics of typical cut-off valves, which is of guiding significance to the structural design of valve seals, thus improving the sealing performance and reliability of the valve.