注意：关闭检测组件上的所有针形阀A, B和C，以及放泄阀A和B.
NOTE: Close all needle valve "A", "B" and "C" and bleed
valve "A" and "B" on test kit.
检测1 - 止回阀1号
Test No. 1 - Check Valve No. 1
步骤1
Step 1 |
确保关闭阀1号开启，关闭阀2号关闭。
Insure shutoff No. 1 is open, shutoff No. 2
is closed. |
步骤2
Step 2 |
确保高端软管位于连接端A高处和测试旋塞3号之间，低端软管位于B低处和测试旋塞2号之间，并开启两个测试旋塞2号和3号。
Install high side hose between connection "A"
highside and test cock No. 3, low side hose between "B" low side and
test cock No. 2 and open both test cock No. 2 and 3. |
步骤3
Step 3 |
开启放泄阀A，将空气从高处放泄出来。
关闭A，然后开启放泄阀B来放泄低处。
关闭B。
Open bleed valve "A" to bleed air from the high
side. Close "A" then open bleed valve "B" to bleed low side. Close
"B." |
步骤4
Step 4 |
将连接端C旁路之间的旁路软管松弛地连接到测试旋塞1号。开启针形阀A高处和C旁路，从旁路软管中排出空气。在测试旋塞1号处紧固旁路软管，开启测试旋塞1号。
Connect bypass hose between connection "C" bypass
and loosely to test cock No. 1. Open needle valves "A" high side and
"C" bypass to vent air from bypass hose. Tighten bypass hose at test
cock No. 1, open test cock No. 1. |
步骤5
Step 5 |
关闭关闭阀1号。慢慢开启放泄阀B直到压差表升到2 psi再关闭。如果压差读数没有减少，表示止回阀处于"关闭紧密"状态。
Close shutoff No. 1. Slowly open bleed "B" until
differential gauge rises to 2psi and close. If the differential reading
does not decrease, record check valve as "tight." |
步骤6
Step 6 |
关闭所有测试旋塞，并开启放泄阀A和B。然后关闭针形阀A，B和C以及放泄阀A和B。从测试旋塞上拆卸软管。
Close all test cocks and open bleed valves "A"
and "B." Then close needle valves "A," "B" and "C" and bleed valves
"A" and "B." Remove hoses from test cocks. |
检测2 - 止回阀2号
Test No. 2 - Check Valve No. 2
步骤7
Step 7 |
将高端软管移到测试旋塞4号，低端软管移到测试旋塞3号，并开启两个测试旋塞3号和4号。从测试旋塞1号上拆卸旁路软管，开启关闭阀1号。
Move the high side hose to test cock No. 4,
low side hose to test cock No. 3 and open both test cock No. 3 and
4. Remove bypass hose from test cock No. 1, open shutoff valve No.
1. |
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步骤8
Step 8 |
开启放泄阀A，从高端排放空气。
关闭放泄阀A，然后开启放泄阀B，排放低端的空气。
关闭放泄阀B。
Open bleed valve "A" to bleed air from the high
side. Close bleed "A" then open bleed "B" to bleed low side.
Close bleed "B." |
步骤9
Step 9 |
将旁路软管松散连接到测试旋塞1号。开启针形阀A高端和C旁路，排放旁路软管中的空气。将旁路软管紧固在测试旋塞1号上，开启测试旋塞1号。
Connect bypass hose loosely to test cock No.
1. Open needle valves "A" high side and "C" bypass to vent air from
the bypass hose. Tighten bypass hose at test cock No. 1, open test
cock No. 1. |
步骤10
Step 10 |
关闭关闭阀1号，然后缓慢开启放泄阀B直到压差表上升到2psi，随后关闭。如果压差读数没有减少，则在关紧时记录下来。关闭所有测试旋塞，并拆卸软管。开启放泄阀A和B。将阀门恢复到初始工作状态。
Close shutoff No. 1, then slowly open bleed
"B" until differential gauge rises to 2psi and close. If the differential
reading does not decrease, record check as tight. Close all test cocks
and remove hoses. Open bleed valves "A" and "B." Restore valve to
original working condition. |
注意：如果关闭阀2号泄漏过于严重，则这个总成可能无法完成上述第一和第二止回阀检测。要检验泄漏的2号关闭阀，需要采用下列程序。
NOTE:
The assembly will fail both the first and second check valve tests
above, if shutoff No. 2 leaks excessively. To test for a leaky No.
2 shutoff, use the following procedure. |
检验泄漏的2号关闭阀
Test for Leaky No. 2 Shutoff
步骤11
Step 11 |
将高端软管连接到测试旋塞1号，低端软管连接到测试旋塞4号。开启测试旋塞1号和4号。关闭关闭阀1号和2号。
Connect the high side hose to test cock No.
1, low side hose to test cock No. 4. Open test cocks No. 1 and 4.
Close shutoffs No.1 and 2. |
步骤12
Step 12 |
关闭针形阀C旁路。开启针形阀A高端，然后开启针形阀B低端一圈，松开连接到测试旋塞4号的软管，排出空气。重新紧固软管。
Close needle valve "C" bypass. Open needle valve
"A" high side, then open needle valve "B" low side one turn, loosen
hose at test cock No. 4 to remove air. Retighten hose. |
步骤13
Step 13 |
如果压差表升到0以上，则关闭阀2号有过于严重的泄漏，因此必须在总成检测上进行更换。
If the differential gauge rises above 0 there
is excessive leakage at shutoff No. 2 and it must be replaced to test
the assembly. |
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