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How to use pneumatic diaphragm control valve selection
Pneumatic diaphragm control valve by the valve body and the valve body (including the valve seat) of two parts, according to the different requirements of the use of different structures. Pneumatic membrane valve mainly through the single-seat valve, two-seat control valve and high-pressure angle control valve. Through the single-seat valve leakage is small, the thrust of the fluid on the single-seat valve unbalanced force formed by a large, so through the single-seat valve is suitable for small leakage requirements, small diameter and low pressure differential valve before and after the occasion. Through the two-seater valve body has two upper and lower valve spool, due to fluid acting on the spool in the opposite direction and generally offset; so the two-seat valve unbalance force is small, allowing the valve before and after a larger pressure. However, due to the complexity of the flow path in the valve body, the erosion damage to the valve body when used for high pressure differential is more serious and should not be used for medium with high viscosity, suspended particles or fibers. In addition, due to the processing conditions, double valve seat up and down the two spools is not easy at the same time off, so when the closure of the large amount of leakage, especially in the case of high temperature or low temperature, the material due to different thermal expansion coefficient is more likely to cause serious Leakage. Angular high-pressure valve body is right angle, the flow path is simple, the resistance is small, high-speed fluid erosion is also small, especially suitable for high pressure differential, high viscosity and suspended solids containing particles of fluid, can also be used to deal with vapor Mixed phase, easy flash steam cavitation occasions. This body prevents coking, sticking and clogging for easy cleaning and self-cleaning.