The working principle and characteristics of the globe valve

The stop valve, also called the cut off valve, is one of the most widely used threaded stop valve illustrations. The reason why it is so popular is that the friction between the sealing surfaces is small during the opening and closing process, which is more durable and has a high opening height. Small, easy to manufacture, convenient to maintain, not only suitable for medium and low pressure, but also suitable for high pressure.

The closing principle of the globe valve is to rely on the pressure of the valve stem to make the sealing surface of the disc and the sealing surface of the valve seat closely fit to prevent the medium from flowing. Our country's valve "Sanhua" once stipulated that the flow direction of the stop valve should be from top to bottom, so there is directionality when installing. The structural length of the shut-off valve is longer than that of the gate valve. At the same time, the fluid resistance is large, and the sealing reliability is not strong during long-term operation.

As one of the most important cut-off valves, the globe valve plays an important role in the aerospace field. As an important component of aerospace equipment, the shut-off valve realizes the functions of medium delivery, cut-off, and adjustment, and its sealing performance directly affects the safe and reliable operation of aerospace equipment. Studying the influencing factors and influence rules of the sealing characteristics of typical shut-off valves has guiding significance for the structural design of the valve sealing pair, so as to improve the sealing performance and reliability of the valve.

The valve plays an important role in cutting off and throttling the medium in the pipeline where it is located. As an extremely important cut-off valve, the shut-off valve is sealed by applying torque to the valve stem. The valve clack exerts pressure to make the sealing surface of the valve clack tightly fit with the sealing surface of the valve seat, and prevent the medium from leaking along the gap between the sealing surfaces. The sealing pair of the globe valve is composed of a valve flap sealing surface and a valve seat sealing surface, and the valve stem drives the valve flap to move vertically along the center line of the valve seat. In the process of opening and closing of the shut-off valve, the opening height is small, the flow is easy to adjust, and the manufacturing and maintenance are convenient, and the pressure application range is wide.

Compared with another commonly used shut-off valve in industrial production, an alarm valve, the shut-off valve is simpler than the former in terms of structure, and is easy to manufacture and maintain. In terms of service life, the sealing surface of the globe 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 sealing surface of the seat, so the wear and abrasion of the sealing surface are small, so the sealing is improved. During the full closing process of the auxiliary service life stop valve, the disc stroke is small, and its height is smaller than that of the alarm valve. The disadvantage of the globe valve is that the opening and closing torque is large and it is difficult to achieve rapid opening and closing. Due to the tortuous flow path in the valve body, the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.