How to judge whether the closing speed of pneumatic ball valve includes positioner?
Pneumatic ball valve is an important equipment to protect the pipeline in the process of pipeline connection. During the use of pneumatic ball valve, it is inevitable to encounter the situation of thermal expansion and cold contraction. Of course, the expansion and contraction of pipeline will not be as obvious as that of valve products. However, when the pipeline is suddenly heated or cooled, it is likely that the pipeline will suddenly become longer or shorter Therefore, people produce pneumatic ball valve to prevent the pipeline from being damaged due to thermal expansion and cold contraction.
Pneumatic ball valve is a kind of pipe joint with a certain amount of expansion. What is the expansion amount? That is, there can be a certain amount of distance between the two ends of the joint, which can be freely extended or shortened within the allowable range of distance. Of course, this expansion amount is relatively limited. When the expansion amount is too large, the limiting device will work and eventually reach the maximum expansion displacement. And the protection of pneumatic ball valve to the pipeline is also reflected from the expansion and contraction. What does this mean? Pneumatic ball valve is to protect the pipeline from thermal expansion and cold contraction. When the pipe is heated or cooled, the length of the pipe will be slightly extended or shortened. This length is very small. However, if each connected pipe is extended or shortened at the same time, the expansion amount is relatively large, which is likely to cause the pipe to be squeezed or the pipe joint to be broken.
However, if pneumatic ball valve connection can be avoided, each pneumatic ball valve can be freely extended or shortened. When the pipeline is heated and expanded, the pneumatic ball valve will be shortened, and when the pipe is cooled for a short time, the pneumatic ball valve will be lengthened to compensate for the expansion and contraction. Therefore, whether the pipeline becomes longer or shorter, it is borne by the pneumatic ball valve, so the pipeline will not be affected, so it can play a protective role on the pipeline. Pneumatic ball valve is an important equipment to protect the pipeline in the process of pipeline connection. After a lot of experience analysis, the service life of the pipeline with pneumatic ball valve is about twice as long as that of the pipeline without pneumatic ball valve. Therefore, besides connecting the pipeline, the protection of pipeline is also an important feature of pneumatic ball valve.