检测止回阀1号
Test Check Valve No. 1
注意：关闭测试组件上的所有针形阀A, B和C，以及排气阀A和B。
NOTE: Close all needle valve "A", "B" and "C"
and bleed valve "A" and "B" on test kit.
步骤1
Step 1 |
确保关闭阀1号处于开启状态，关闭阀2号处于关闭状态。
Insure shutoff No. 1 is open, shutoff No. 2
is closed. |
步骤2
Step 2 |
在连接A高端和测试旋塞3号之间安装高端软管，在B低端和测试旋塞2号之间安装低端软管，打开两个测试旋塞2号和3号。
Install high side hose between connection "A"
high side 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 |
开启排气阀A，从高端排出空气。
关闭A，然后开启排气阀B对低端排气。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 |
在连接C旁路之间连接旁路软管，使其松弛地连接到测试旋塞1号。开启针形阀A高端和C旁路，排出旁路软管内的空气。在测试旋塞1号上紧固旁路，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。慢慢开启排气B直到差压计上升到2 PSI，然后关闭。如果差压读数没有增加，则记录止回阀为“紧密”。
Close shutoff No. 1. Slowly open bleed "B" until
differential gauge rises to 2 PSI 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，开启排气阀A和B。然后关闭针形阀A, B和C，以及排气阀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. |
检测止回阀2号
Test 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，开启测试旋塞3号和4号。从测试旋塞1号拆卸旁路软管，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 |
开启排气阀A从高端排出空气。关闭排气A，然后开启排气B排出低端空气。关闭排气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 |
将旁路软管松弛地连接到测试旋塞1号。开启针形阀A高端和C旁路，从旁路软管排出空气。紧固测试旋塞1号上的旁路软管，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，然后慢慢开启排气B直到差压计上升到2 PSI，然后关闭。如果差压读数没有增加，记录止回阀为紧密。关闭所有测试旋塞，并拆卸软管。开启排气阀A和B。恢复阀门到原先的工作状态。
Close shutoff No. 1, then slowly open bleed
"B" until differential gauge rises to 2 PSI 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，对这种总成的第一和第二止回阀的上述检测就可能无法进行。为了检测2号关闭阀的泄漏率，请采用下列程序。
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.
检测2号关闭阀的泄漏率
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，将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，放松测试旋塞4号上的软管，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 |
如果差压计上升到0以上，则关闭阀2号的泄漏过于严重，必须将其更换以便检测总成。
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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