进出口阀 meaning in English

terminal valve

This means that the air vessels are always charged to an optimum degree and that pulsations are reduced to a negligible level ( even with single - acting pumping systems ) , which plays an important role in preventing the delivery valves and the gearbox from shocks and prolonging their service life
这表明空气槽总是被充气至最佳程度，而脉冲被减少到可以忽略的地步（单作用泵系统亦然） ,这对于保护进出口阀和齿轮箱免受冲击,延长它们的使用寿命起着重要的作用。