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- Forward needle valve positions for easy access. 針形閥位置提前,便于接近。
- Attach vent (yellow) hose to TC#4 and vent needle valve. 連接排氣（黃）軟管到測試旋塞4號和排氣針形閥上。
- Open TC#3, needle valve "B ", and vent needle valve. 開(kāi)啟測試旋塞3號，針形閥“B”，和排氣針形閥。
- Open TC#2 and needle valve "A", close needle valve "A" and TC #4. 開(kāi)啟測試旋塞2號和針形閥“A”，關(guān)閉針形閥“A”和測試旋塞4號。
- Close needle valve "A" high side (red) and open test cock No. 2. 關(guān)閉針形閥“A”高端（紅），并開(kāi)啟測試旋塞2號。
- All needle valves must be closed on test kit. 檢測組件上的所有針形閥必須關(guān)閉。
- Open vent needle valve and bleed air from hose. Then close vent valve. 開(kāi)啟排氣針形閥，并從軟管排放空氣。然后關(guān)閉排氣閥。
- Open vent needle valve fully until dripping from vent connection stops. 完全開(kāi)啟排氣針形閥直到從排氣連接處的滴漏停止為止。
- Open test cock No. 2 and needle valve "A" high side (red) on test kit. 開(kāi)啟測試旋塞2號和檢測組件上的針形閥“A”高端（紅）。
- Before starting test all needle valves must be closed. 在開(kāi)始檢測之前,所有閥門(mén)都必須關(guān)閉。
- Before starting test, all needle valves on test kit must be closed. 在開(kāi)始檢測前,檢測組件上的所有針形閥都必須關(guān)閉。
- Needle valves have NPS / internal pipe threaded ends. 針形閥配置NPS內管螺紋連接端口。
- Open needle valve" A" high side and vent needle valve to vent air from bypass hose. 開(kāi)啟針形閥“A”高端和排氣針形閥，從旁路軟管排放空氣。
- Open needle valve "B" low (blue) very slowly until the differential gauge needle starts to drop. 很慢地開(kāi)啟針形閥“B”低端（藍），直到壓差表指針開(kāi)始下降為止。
- Close test cock No. 4. Disconnect bypass hose (yellow) at test cock No. 4. Close vent needle valve. 關(guān)閉測試旋塞4號。斷開(kāi)測試旋塞4號上的旁路軟管（黃）。關(guān)閉排氣針形閥。
- Connect bypass hose between vent needle valve and loosely connect to test cock No. 1. 在排氣針形閥上連接旁路軟管，并將其松散連接到測試旋塞1號上。
- Open needle valve "B" low very slowly until the differential reading starts to drop. 慢慢開(kāi)啟針形閥“B”低端，直到壓差讀數開(kāi)始下降為止。
- Open TC #4 and loosen hose at vent needle valve connection bleeding air from test kit. 開(kāi)啟測試旋塞4號，松開(kāi)排氣針形閥上的軟管，從檢測組件上排放空氣。
- Slowly open vent needle valve just as air inlet opens. Record differential pressure. 當空氣進(jìn)口開(kāi)啟時(shí),慢慢開(kāi)啟排氣針形閥。記錄壓差。
- Slowly open needle valve "C" bypass (yellow) just as air inlet opens. Record differential pressure. 正當空氣進(jìn)口打開(kāi)時(shí)，慢慢開(kāi)啟針形閥“C”旁路（黃）。記錄壓差。
