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Matters needing attention when selecting electric globe valve

by:Sino Valves     2021-03-01
Electric shut-off valve, also called cut-off valve, is one of the most widely used valves. Its popularity is due to the low friction between the sealing surfaces during the opening and closing process, which is relatively durable, and the opening height is not large. Easy and convenient to maintain, not only suitable for medium and low pressure, but also 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. my country's 'Sanhua' valve once stipulated that the flow direction of the stop valve should be from top to bottom, so there is a directionality when installing. The structural length of the electric shut-off valve is longer than that of the gate valve, and 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 electric 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. The study of the influencing factors and influence rules of typical shut-off valve sealing characteristics has guiding significance for the structural design of valve sealing pairs, thereby improving the sealing performance and reliability of the valve. The working principle and characteristics of the electric shut-off valve. The valve plays an important role in cutting off and throttling the medium in the pipeline. The shut-off valve is an extremely important cut-off valve. Its sealing is by applying a torque to the valve stem. The rod applies pressure 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 are closely attached, and the medium is prevented from leaking along the gap between the sealing surfaces. The sealing pair of the electric globe valve is composed of the valve flap sealing surface and the valve seat sealing surface. The valve stem drives the valve flap to move vertically along the center line of the valve seat. During the opening and closing process of the globe 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 cut-off valve in industrial production, an alarm valve, the electric 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 relatively small compared to 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. Because the flow passage in the valve body is relatively tortuous, the fluid flow resistance is large, and the fluid power is lost in the pipeline. The electric globe valve has a simple structure and is easy to manufacture and maintain. The sealing surface is not easy to wear and wear, and the sealing performance is good. There is no relative sliding between the opening and closing valve and the sealing surface of the valve body, so the wear is not serious, the sealing performance is good, and the service life is long. When the valve is closed, the disc stroke is small, so the height of the stop valve is smaller than the gate valve, but the structure length is longer than the gate valve. Opening and closing moments, opening and closing is more difficult, long time opening and closing. Fluid resistance, because the fluid passage of the valve body in the valve body is relatively tortuous, the fluid resistance is large and the power consumption is large. The full-time valve flap is often eroded. The valve has a simple structure and is easy to manufacture and maintain. The working hours are small and the opening and closing time is short. Good sealing performance, low friction between sealing surfaces, and long life. In the process of opening and closing, the sealing surface ratio is small and wear-resistant. Usually there is only one sealing surface, and the manufacturing process is good and easy to repair. But on the contrary, his resistance is great, and he needs more strength when opening and closing. Not suitable for particles, viscosity, and easy to burn. Poor adjustment performance.  High temperature, high pressure medium pipeline or device should use electric shut-off valve. Thermal power plants, nuclear power plants, high-temperature and high-pressure pipelines in petrochemical systems. The pipeline flow resistance requirements of the pipeline are not strict. The place is not small. A small needle valve can be used. Instrument valves, sampling valves, pressure gauge valves, etc. Flow adjustment or pressure adjustment, but the adjustment accuracy is not high, and the pipe diameter is small, such as the nominal diameter of the pipe less than 50mm, it is best to use.
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