将旋钮旋转到全开位置。
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.
必须把阀门开到完全开启的位置，以提供完全的流通。
It is not necessary to open this valve to the full open position to provide full flow to the process.
必须把阀门开到完全开启的位置，以提供完全的流通。
It is not necessary to open this valve to the full open position to provide full flow to the process.
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