fluorine lining gate valve

Pneumatic valve knowledge details

by:Lianke Valve     2022-08-08
Pneumatic ball valve is a commonly used control element. It is evolved from a plug valve and has the same 90-degree rotation action. The difference is that the plug body is a sphere with a circular through hole or channel through its axis. This article mainly introduces the uses and advantages of pneumatic ball valves, hoping to help you better apply products. The working principle of pneumatic ball valve is to make the valve unblocked or blocked by rotating the valve core. Pneumatic ball valve switch is light, small size, can be made into large diameter, reliable sealing, simple structure, convenient maintenance, sealing surface and spherical surface are often closed, not easy to be eroded by medium, and are widely used in various industries. Pneumatic ball valve and plug valve are the same type of valve, only its closing part is a sphere, and the sphere rotates around the center line of the valve body to achieve opening and closing. Pneumatic ball valves are mainly used in pipelines to cut off fast, distribute and change the flow direction of the medium. Advantages of pneumatic ball valve 1. The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section of the same length. 2. Simple structure, small size and light weight. 3. Tight and reliable. At present, the sealing surface material of ball valve is widely used plastic, which has good sealing performance and has also been widely used in vacuum system. 4. Easy to operate, open and close quickly, just rotate 90° from fully open to fully closed, which is convenient for long-distance control. 5. The maintenance is convenient, the pneumatic ball valve has a simple structure, the sealing ring is generally movable, and it is more convenient to disassemble and replace. 6. When fully open or fully closed, the sealing surfaces of the ball and the valve seat are isolated from the medium, and the sealing surface of the valve will not be eroded when the medium passes through. 7. Wide range of applications, diameters ranging from small to several millimeters, large to several meters, and can be applied from high vacuum to high pressure. 8. Because the power source of the pneumatic ball valve is gas, the pressure is generally 0.2-0.8MPa, which is relatively safe. If the pneumatic ball valve leaks, compared with hydraulic and electric, the gas can be discharged directly, which does not pollute the environment and has high safety. 9. Compared with manual and turbine rotating ball valves, pneumatic ball valves can be configured with large diameters (manual and turbine rotating ball valves are generally below DN300 diameter, and pneumatic ball valves can currently reach DN1200 diameter.) Pneumatic ball valves have been widely used in petroleum and chemical industries. , power generation, papermaking, atomic energy, aviation, rockets and other sectors, as well as people's daily life. According to the structure, the pneumatic ball valve can be divided into one. The floating pneumatic ball valve The ball of the pneumatic ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and be pressed on the sealing surface of the outlet end to ensure the sealing of the outlet end. The structure of the floating pneumatic ball valve is simple and the sealing performance is good, but the load of the ball bearing the working medium is all transferred to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves. 2. Fixed ball pneumatic ball valve The ball of the pneumatic ball valve is fixed and does not move after being pressed. The fixed ball valve has a floating valve seat. After being pressurized by the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure the sealing. Bearings are usually installed on the upper and lower shafts with the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the pneumatic ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared in recent years. Special lubricating oil is injected between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operation. torque, more suitable for high-pressure and large-diameter ball valves. Third, the elastic ball pneumatic ball valve The ball of the pneumatic ball valve is elastic. Both the ball and the valve seat sealing ring are made of metal materials, and the sealing specific pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and external force must be applied. This valve is suitable for high temperature and high pressure medium. The elastic sphere is to open an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When closing the channel, use the wedge head of the valve stem to expand the ball and press the valve seat to achieve sealing. Before turning the ball, loosen the wedge head, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface. Pneumatic ball valve can be divided into straight-through type, three-way type and right-angle type according to its channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.
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