当打开燃气具的开关后，液化石油气从减压阀内流出，使减压室内的压力下降，橡胶薄膜下凹，带动杠杆下移，外部空气从呼吸孔进入上气室，使阀垫向中移动，进气喷嘴变大，进气量增加，压力升高。 这样反复不断的调节过程使减压室的压力总是恒定的，即不管进气压力偏高还是偏低，出口压力总是稳定的，从而直到降压和稳压的作用。

When the switch of the gas appliance is turned on, liquefied petroleum gas flows out of the pressure reducing valve, causing the pressure inside the pressure reducing chamber to decrease. The rubber film is concave, driving the lever to move downwards. External air enters the upper chamber through the breathing hole, causing the valve pad to move towards the center, increasing the intake nozzle, increasing the intake volume, and increasing the pressure. This repeated adjustment process keeps the pressure of the pressure reducing chamber constant, that is, regardless of whether the inlet pressure is high or low, the outlet pressure is always stable, until the pressure is reduced and stabilized.