Two common factors affecting the service life of pneumatic diaphragm valves


Two common factors affecting the service life of pneumatic diaphragm valves

1. The method of working with a large opening to extend the service life allows the pneumatic control valve to work at the maximum opening as far as possible, such as 90%. In this way, damages such as cavitation and erosion occur on the head of the valve core. As the spool is destroyed and the flow increases, the corresponding valve is closed again. This will continue to destroy and gradually close, so that the entire spool is fully utilized until the root and sealing surface of the spool are damaged and cannot be used. At the same time, the large-opening working throttle gap is large and the erosion is weakened. This can increase the life of the valve by more than 1 to 5 times compared with the initial operation of the valve at the middle and small openings. Similarly, if a chemical plant adopts this method, the service life of the pneumatic diaphragm valve is increased by 2 times.

2.Decrease S to increase the working opening and increase the life. Method to reduce S, that is, increase the loss of the system except for the pneumatic control valve, so that the pressure drop distributed to the valve is reduced, in order to ensure that the flow passes through the pneumatic control valve, the pneumatic adjustment must be increased At the same time, the valve opening degree reduces the pressure drop on the valve, which reduces the cavitation and erosion. The specific methods are as follows: an orifice throttling is installed behind the valve to consume the pressure drop and close the manual valve connected in series in the pipeline until the pneumatic regulating valve obtains a more ideal working opening. It is very simple, convenient and effective to adopt this method for pneumatic diaphragm valves in the same way when the valve is selected to work at a small opening at the beginning.


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