该疏水阀的结构比较简单，主要由浮球和自动排空装置组成。
This steam trap has a simple structure, mainly consisting of float balls and automatic emptying devices.
其优点是排空容积小、抽真空快、装置简单轻便、重量轻、体积小。
It has such advantages as small empty volume, high vacuumizing speed, simple and convenient structure, etc.
先排空塑料袋，再用橡皮压挤球或者其它泵类装置将样品充入袋内。
The bag is purged and filled with samples using a rubber squeeze bulb or other pumping devices.
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