Feb. 05, 2020
Globe valve supplier introduces you: Globe valve, also known as shut-off valve, is one of the most widely used valves. It is popular because of friction between sealing surfaces during opening and closing Low force, relatively durable, low opening height, easy manufacture, and convenient maintenance. It is not only suitable for medium and low pressure, but also for high pressure. The closing principle of the shut-off valve is to rely on the pressure of the valve rod to make the sealing surface of the valve disc and the sealing surface of the valve seat closely to prevent the medium from flowing. China's valve "three chemical supply" has stipulated that the flow direction of the shut-off valve will always be used from top to bottom, so there is directionality during installation. The structure of the shut-off valve is longer than the gate valve, and the fluid resistance is large. The sealing reliability is not strong during long-term operation.
Globe valve, as one of the most important shut-off valves, plays an important role in the aerospace field. As an important component of aerospace equipment, the shut-off valve realizes the functions of media transportation, cut-off, adjustment, etc. Its sealing performance directly affects the safe and reliable operation of aerospace equipment. Studying the influencing factors and influencing laws of typical globe valve sealing characteristics has guiding significance for the structural design of the valve sealing pair, thereby improving the sealing performance and reliability of the valve.
Globe valve working principle and characteristics:
The valve plays an important role in cutting off and throttling the medium in the pipeline where it is located. As a very important shut-off valve, the valve is sealed by applying torque to the valve stem. The valve disc exerts pressure to make the valve disc sealing surface and the valve seat sealing surface closely fit to prevent the medium from leaking along the gap between the sealing surfaces.
The sealing pair of the stop valve is composed of a valve disc sealing surface and a 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 shut-off valve, the opening height is small, the flow rate is easy to adjust, and the manufacturing and maintenance are convenient, and the pressure is applicable in a wide range.
Compared with the other commonly used shut-off valves in industrial production, one by one, the stop valve is simpler in structure than the former, which is easier to manufacture and maintain. In terms of service life, the sealing surface of the shut-off valve is not easy to wear and abrasion, and there is no relative sliding between the valve disc and the seat sealing surface during the valve opening and closing process. The service life of the pair of shut-off valves in the fully closed process is small, and the height of the valve is smaller than that of the 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. Because the flow passage in the valve is relatively tortuous, the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.
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