当齿间容积与排气口相通时，油气混合空气从排气口排出。
When the volume and between vent, oil and gas air mixture interlinked from vent discharge.
双螺杆泵作为一种容积式泵，泵内吸入室应与排出室严密地隔开。
Double screw pump as a positive displacement pump, the pump suction chamber should be closely separated and discharge chamber inside.
当准备好启动离心式泵时，吸入阀全开，容积式排出阀节流。
When ready to start centrifugal pumps, fully open suction valves and throttle discharge valves of a positive displacement.
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