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。
Open needle valve "b" to bleed air and then close "b" and vent needle valve.
开启针形阀“B”排放空气，然后关闭“B”和排气针形阀。
In this system, I often close the needle valve, needle valve is always open.
在该系统中，针形阀i常闭，针形阀常开。
In this system, I often close the needle valve, needle valve is always open.
在该系统中，针形阀i常闭，针形阀常开。
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