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float needle valve 浮针阀
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。