完全可调整的开启角度 Fully adjustable opening angle
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.
完全开启排气针形阀直到从排气连接处的滴漏停止为止。
Open vent needle valve fully until dripping from vent connection stops.
如果有需要，内部玻璃层可完全开启，使整个空间南北向通风。
If needed, is also possible to totally open the inner glass layer to ventilate the whole space from south to north.
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