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Principle of Stop Valve

Released on May. 15, 2020

Stop valve, also known as the shut-off valve, is one of the most widely used valves. The reason why it is so popular is that the friction between the sealing surfaces during opening and closing is small, more durable, the opening height is not large, and the manufacturing is easy. Easy maintenance, not only suitable for medium and low pressure but also suitable for high pressure. The shut-off valve is a force-sealed valve, so when the valve is closed, pressure must be applied to the clapper to force the sealing surface to not leak.

The working principle of the stop valve: The valve plays an important role in cutting off and throttling the medium in the pipeline. As a very important shut-off valve, the stop valve is sealed by applying torque to the valve stem. The pressure is applied to the valve flap in the axial direction so that the sealing surface of the valve flap and the sealing surface of the valve seat closely fit together to prevent the medium from leaking along the gap between the sealing surfaces.

Stop Valve

The sealing of the stop valve is composed of the valve disc sealing surface and the valve seat sealing surface, and the valve stem drives the valve disc to move vertically along the centerline of the valve seat. During the opening and closing process of the stop valve, the opening height is small, easy to adjust the flow, and easy to manufacture and maintain, with a wide range of pressure application.

Compared with another gate valve, one of the commonly used shut-off valves in industrial production, from the structural point of view, the stop valve is simpler than the former, which is convenient for manufacturing and maintenance. In terms of service life, the sealing surface of the stop valve is not easy to be worn and scratched. During the opening and closing of the valve, there is no relative sliding between the valve flap and the sealing surface of the seat. The service life shut-off valve of the auxiliary valve has a small flap stroke in the fully closed process, and its height is smaller than other valves. The disadvantage of the stop valve is that the opening and closing torque are large and it is difficult to achieve rapid opening and closing. Because the flow path in the valve body is relatively tortuous, the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.

The above information is provided by the shut-off valve factory.