Attach vent ( yellow ) hose to TC # 4 and vent needle valve.

连接排气 ( 黄 ) 软管到测试旋 塞 4号和排气针形阀上.

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Re - tighten hose to vent needle valve.

重新紧固排气针形阀上的软管.

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Close test cock No.4. Disconnect bypass hose ( yellow ) at test cock No.4. Close vent needle valve.

关闭测试旋塞4号. 断开测试旋塞4号上的旁路软管 ( 黄 ). 关闭排气针形阀.

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Connect bypass hose between vent needle valve and loosely connect to test cock No. 1.

在排气针形阀上连接旁路软管,并将其松散连接到测试旋塞1号上.

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Open TC # 4 and loosen hose at vent needle valve connection bleeding air from test kit.

开启测试旋 塞 4号,松开排气针形阀上的软管,从检测组件上排放空气.

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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.

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Slowly open vent needle valve just as air inlet opens. Record differential pressure.

当空气进口开启时,慢慢开启排气针形阀. 记录压差.

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