Cut-off valve, also called sectional door, is one of the most widely used valves. Its popularity is due to the small friction between the sealing surfaces in the process of opening and closing. It is more durable, and its opening height is not so large, making it easy to manufacture. Easy maintenance, not only for medium and low pressure, but also for high pressure. The principle of closure of the shut-off valve is to rely on the pressure of the valve rod so that the sealing surface of the valve flap and the sealing surface of the valve seat fit closely and prevent the flow of the medium. China's valve "three to give" has stipulated that the flow direction of the globe valve is always adopted from top to bottom, so the direction of installation. The structure of the stop valve is longer than the gate valve, and the fluid resistance is large. In long-term operation, the seal reliability is not strong.
As one of the most important truncated valves, the globe valve plays an important role in the aerospace field. As an important component of aerospace equipment, the globe valve achieves the functions of media transmission, cut-off, and adjustment, and its sealing performance directly affects the safe and reliable operation of aerospace equipment. The influencing factors and influence laws of the sealing characteristics of the typical shut-off valve are studied, which have guiding significance for the structural design of the valve sealing pair, so as to improve the sealing performance and reliability of the valve.
The seal of the stop valve consists of the valve sealing surface and the valve seat sealing surface. The valve stem drives the valve flap to move vertically along the centerline of the valve seat. In the opening and closing process of the closing valve, the starting height is small, the flow rate is easy to adjust, and the manufacturing and maintenance are convenient, and the pressure application scope is wide.