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- material needle valve 涂料针形阀
- Forward needle valve positions for easy access. 针形阀位置提前,便于接近。
- 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。
- Open TC#3, needle valve "B ", and vent needle valve. 开启测试旋塞3号，针形阀“B”，和排气针形阀。
- Open TC#2 and needle valve "A", close needle valve "A" and TC #4. 开启测试旋塞2号和针形阀“A”，关闭针形阀“A”和测试旋塞4号。
- Close needle valve "A" high side (red) and open test cock No. 2. 关闭针形阀“A”高端（红），并开启测试旋塞2号。
- All needle valves must be closed on test kit. 检测组件上的所有针形阀必须关闭。
- 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 vent needle valve fully until dripping from vent connection stops. 完全开启排气针形阀直到从排气连接处的滴漏停止为止。
- Open test cock No. 2 and needle valve "A" high side (red) on test kit. 开启测试旋塞2号和检测组件上的针形阀“A”高端（红）。
- Before starting test all needle valves must be closed. 在开始检测之前,所有阀门都必须关闭。
- Before starting test, all needle valves on test kit must be closed. 在开始检测前,检测组件上的所有针形阀都必须关闭。
- Needle valves have NPS / internal pipe threaded ends. 针形阀配置NPS内管螺纹连接端口。
- Open needle valve" A" high side and vent needle valve to vent air from bypass hose. 开启针形阀“A”高端和排气针形阀，从旁路软管排放空气。
- Open needle valve "B" low (blue) very slowly until the differential gauge needle starts to drop. 很慢地开启针形阀“B”低端（蓝），直到压差表指针开始下降为止。
- 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。
- 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。
- Open needle valve "B" low very slowly until the differential reading starts to drop. 慢慢开启针形阀“B”低端，直到压差读数开始下降为止。
- 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。
- 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。
