Working principle and characteristics of stop valve

The valve plays an important role in cutting off and throttling the medium in the pipeline in which it is located. As an extremely important cut-off valve, the stop valve is sealed by applying torque to the valve stem, which moves in the axial direction. The valve disc exerts pressure to make the valve disc sealing surface and the valve seat sealing surface closely fit, preventing the medium from leaking along the gap between the sealing surfaces.
The sealing pair of the stop valve is composed of the valve disc sealing surface and the valve seat sealing surface. The valve stem drives the valve disc to move vertically along the center line of the valve seat. During the opening and closing process of the stop valve, the opening height is small, easy to adjust the flow rate, easy to manufacture and maintain, and has a wide range of pressure applications.
Compared with the gate valve, another commonly used cut-off valve in industrial production, the stop valve is structurally simpler and easier to manufacture and maintain. In terms of service life, the sealing surface of the stop valve is not easy to wear and scratch. During the opening and closing process of the valve, there is no relative sliding between the valve disc and the seat sealing surface, so the wear and scratches on the sealing surface are small, so the sealing is improved. The service life of the stop valve is that the valve disc stroke is small during the fully closed process, and its height is smaller than that of the gate valve. The disadvantage of the stop valve is that the opening and closing torque is large and it is difficult to open and close quickly. Because the flow path in the valve body is relatively tortuous and the fluid flow resistance is large, the fluid power is lost in the pipeline.