Pneumatic ball valve sealing performance and using life

pneumatic ball valve with reducing and generally not reducing channel two structures. No matter the structure, pneumatic ball valve flow resistance coefficient is small. Especially the so-called full flow type, namely not reducing pneumatic ball valve, due to its channel diameter equal to the inner diameter pipeline, local resistance loss only equivalent length of pipe friction resistance, namely in all pneumatic valves, the pneumatic ball valve minimum flow resistance. In rocket and its experimental system, the requirements of pipeline resistance as small as possible. There are two ways to reduce the resistance of piping system: one is to reduce the fluid velocity, therefore need to increase diameter and pneumatic valve size, for the efficiency of pipeline system tends to produce adverse effect, especially for conveying system at low temperature ( Liquid hydrogen is very bad; Second is to reduce the local resistance of pneumatic valve, therefore, pneumatic ball valve have naturally become the best choice. ( Pneumatic ball valve opening and closing the switch quickly and conveniently. Since only the pneumatic ball valve in the general case rotates ° completes the fully open or close the action, it is easy to realize rapid opening and closing. Can realize the rapid opening and closing, only for some of the structure of the opening and closing time. ~。 S to ensure that can be used to test the automation system. Pneumatic valve rapid opening and closing, no impact on the operation. ( Pneumatic ball valve sealing performance is good. At present, most of the pneumatic ball valve pneumatic valve seat is made of elastic material such as ptfe, sealing pair of metallic and non-metallic materials, often referred to as soft seal. In general, soft seal sealing easy to guarantee, and the machining accuracy and surface roughness on the surface of the sealing requirement is not high. ( Pneumatic ball valve long service life. Because ptfe have good self-lubrication, and sphere of friction and wear is small, and because the ball processing technology improvements, reduce roughness, thus improve the service life of the pneumatic ball valve