A typical transfer line for dewars is connected to a bayonet that provides a means of using product vapor pressure build-up or an external pressure source to remove the liquid.
用于杜瓦瓶的典型的转移管连接到卡口上，利用产品积累的蒸气压或外部的压力源来取出液体。
They may be installed either upstream or downstream of a regulator or meter, and may be controlled directly or from a remote pressure source by means of an external control line.
它们可安装于减压阀或计量表上下游，并可直接控制或以外接远端压力源控制线做远端控制。
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