Principle of pneumatic butterfly valve:
Pneumatic butterfly valve (gasspring) is an industrial accessory that can support, cushion, brake, height adjustment, angle adjustment and other functions.
It consists of the following parts: pressure cylinder, piston rod, piston, seal guide sleeve, filler (inert gas or oil gas mixture), control elements inside the cylinder and outside the cylinder (controlled gas ball valve) and valves. 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, the balloon valve has significant advantages over the ordinary ball valve: the speed is relatively slow, the dynamic force changes little (generally within 1:1.2), and it is easy to control; The disadvantage is that the size is smaller than the screw ball valve, the cost is high, and the service life is relatively short.