Open vent needle valve and bleed air from hose. Then close vent valve.
开启排气针形阀，并从软管排放空气。然后关闭排气阀。
When the volume and between vent, oil and gas air mixture interlinked from vent discharge.
当齿间容积与排气口相通时，油气混合空气从排气口排出。
Open valve a to vent air from the vent hose.
开启阀门A从排气软管处排出空气。
Open valve a to vent air from the vent hose.
开启阀门A从排气软管处排出空气。
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