液面下降时，节流阀打开，升高时，节流阀关闭。
It throttles open on a lowering liquid level and throttles closed upon a rising liquid level.
放气口开度减小，射流现象不明显，并出现明显的液面下降过程。
When the vent opening reduces, the jet flow phenomenon is not obvious, and an obvious process of liquid level dropping could present.
在煤层气井排采过程中，通常用回声仪来监测环空液面变化，通过控制液面下降速度来实现稳定、连续降压。
The echometer was used to monitor the change of the annular water level in the coal- bed methane(CBM)wells production, which could decrease pressure stably and continuously.
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