(3) O-ring This is a new flange connection form, which was born with rubber O-ring. In the eyes of Xiao Bian, its sealing effect is higher than that of ordinary gaskets, and it is more reliable. 　　

Of course, in order to reduce the pressure loss, electric butterfly valves are sometimes selected to be larger, so that the flow rate is lower. However, if conditioning is required at a small flow rate, this cannot be done. The rapid transpiration and re condensation of liquid in a very short time when it flows through an area with very low absolute pressure is called cavitation. This phenomenon cannot occur in the gas flow, because the state of gas will not change under low pressure. When the fluid flows into the area with high pressure, the vapor bubble will suddenly condense, and the bubble will collapse or burst. The flow rate of this explosion may reach llOm/s and high pressure 50MPa, which will cause impact damage to the wall.