Two common factors affecting the service life of pneumatic diaphragm valve:
1, Large opening work to extend the life of the method to make the pneumatic regulating valve at the beginning of the maximum opening as far as possible, such as 90%. In this way, cavitation, erosion and other damage occurs on the spool head. With the damage of the spool, the flow increases, the corresponding valve is closed a little more. So that the continuous damage, gradually closed. So that the whole spool is fully used. Until the root and sealing surface of the spool are damaged and can not be used. At the same time, the throttle clearance of the large opening is large. And the erosion is weakened, which is more than 1 ~ 5 times longer than the working life of the valve in the middle opening and small opening at the beginning. Similarly, if a chemical plant uses this method. The service life of pneumatic diaphragm valve is increased by 2 times.
2, Reduce S and increase the working opening to improve the life of the method to reduce S. That is, increase the system in addition to the pneumatic control valve loss. So that the distribution of pressure drop to the valve is reduced. In order to ensure the flow through the pneumatic control valve, will increase the pneumatic control valve opening. At the same time, the valve pressure drop is reduced. So that cavitation, erosion is weakened. Specific methods are: after the valve orifice plate throttle consumption pressure drop. Close the manual valve in series on the pipeline until the pneumatic regulating valve obtains a better working opening. At the beginning of the valve selection in a small opening, the same way pneumatic diaphragm valve using this method is very simple, convenient and effective.