Oxygen flows through the pressure reducing regulator and shut off valve to the masks.

氧气通过减压调节器和关断活门流向氧气面罩。

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Butterfly valve through the valve shaft rotation to drive the rotation of a disc-shaped disc, to open and close a valve, cut off from the main pipe and throttle with.

进口蝶阀是指通过阀轴旋转来带动一个圆盘形的蝶板的转动，达到开启与关闭的一种阀门，在管道上主要起切断和节流用。

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Wherein the control pressure is called pressure control valve to control the flow of known flow control valve to control flow through ﹑ called off and the direction control valve.

其中控制压力的称为压力控制阀，控制流量的称为流量控制球阀，控制通﹑断和流向的称为方向控制球阀。

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