The electric butterfly valve is filled with compressed air in a sealed container, and uses the compressibility of the gas to realize its elastic function. The electric butterfly valve has an ideal nonlinear elasticity. After the height adjustment device is installed, the body height does not change with the increase or decrease of the load. The rigidity of the butterfly valve can be designed to be low, and the ride is quiet. However, the suspension structure of electric butterfly valve is complex and the manufacturing cost is high.
The working principle is to fill the closed pressure cylinder with inert gas or oil gas mixture, so that the pressure in the chamber is several times or dozens of times higher than the atmospheric pressure. The movement of the piston rod is realized by using the pressure difference generated by the cross-sectional area of the piston rod being less than the cross-sectional area of the piston. Because of the fundamental difference in principle, air butterfly valves have obvious advantages over ordinary butterfly valves: relatively slow speed, little dynamic force change (generally within 1:1.2), and easy control; The disadvantage is that the size is smaller than the screw butterfly valve, the cost is high, and the service life is relatively short.
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