The pneumatic ball valve uses the ball to rotate 90 ° around the axis of the valve stem to achieve the purpose of opening and closing.
feature:
1. Pneumatic ball valves are mainly used to cut off, distribute and change the direction of medium flow on the pipeline. Pneumatic ball valves designed as V-shaped openings also have a good flow adjustment function. When the valve is closed, the valve seat on the upstream and downstream sides blocks the liquid, and the accumulation in the cavity of the valve body can be secreted by the secretion device. When the pressure in the side chamber is abnormally added, the medium medium can automatically release the pressure by pushing the valve seat based on its own thrust, and then ensure the safety of the valve. The stem adopts a bottom-mounted structure with an inverted seal. The sealing force of the inverted seal increases with the increase of the medium pressure, so it can ensure the reliable sealing of the stem, and when the stem is abnormally boosted, the stem will not eject . According to the working conditions and the needs of users, the ball valve can be designed as a fireproof structure. When operating the valve, due to the friction between the ball and the valve seat, cattle electrostatic charge will occur and accumulate on the ball. In order to prevent the occurrence of static sparks, an electrostatic device is specially installed on the valve to discharge the charge accumulated on the ball.
advantage:
1. The fluid resistance of the pneumatic ball valve is small, and its resistance coefficient is equal to that of the pipe section of the same length. Simple structure, small size and light weight. It is tight and reliable. The sealing surface material of ball valve is widely used plastic and has good sealing performance. It has also been widely used in vacuum system. It is easy to operate and quick to open and close. It only needs to rotate 90 ° from fully open to fully closed to facilitate remote control. The maintenance is convenient, the structure of the pneumatic ball valve is simple, the sealing ring is generally movable, and the disassembly and replacement are more convenient. When fully open or fully closed, the sealing surfaces of the ball and the valve seat are isolated from the medium. When the medium passes through, it will not cause corrosion of the valve sealing surface. It has a wide range of applications, from small diameters to a few millimeters to a few meters, from high vacuum to high pressure. Because the power source of the pneumatic ball valve is gas, it is generally 0, 2-0, 8MPa pressure, which is relatively safe. If the pneumatic ball valve leaks, the gas can be directly discharged compared to the hydraulic and electric, which has no pollution to the environment and has high safety.
Disadvantages:
1. The adjustment performance of the pneumatic ball valve is worse than that of the globe valve; because the main seat sealing material of the pneumatic ball valve is PTFE, it is inert to almost all chemical substances. However, the physical characteristics of PTFE, including the higher coefficient of expansion, sensitivity to cold flow and poor thermal conductivity, require that the design of the valve seat seal must be carried out around these characteristics. When the sealing material becomes hard, the reliability of the seal is destroyed. Moreover, PTFE has a low temperature resistance level and can only be used at less than 180 ° C. Above this temperature, the sealing material will age. If you want to use it for a long time, it is generally recommended to use it at 120 ℃;
Pneumatic ball valves are not allowed to use valves with reduced diameters under certain working conditions. This aspect is to reduce the resistance loss of the pipeline, on the other hand, it is to avoid obstacles caused by mechanical shrinkage of the pipeline after the diameter shrinks.
Wenzhou Dico Valve Technology Co.,Ltd.
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Wenzhou Dico Valve Technology Co.,Ltd.
