Requirement: Air inlet must start to open when down stream pressure is 1.0 PSI or above.
要求：当下游流体压力在1.0PSI及以上时，空气进口必须开始打开。
Turn off supply pressure and observe float drop to open air inlet.
关闭供应压力，观察浮子下降，因此开启。
Air inlet must be fully open when supply pressure is atmospheric.
当供应压力等于大气压力时，空气进口必需处于全开位置。
Air inlet must be fully open when supply pressure is atmospheric.
当供应压力等于大气压力时，空气进口必需处于全开位置。
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