Install Instructions

6
Test Procedure for
Double Check Valve Assembly
A. Before starting test, all needle valves and bleed valves on test kit must be closed.
B. Flush test cocks before test.
NOTE: Supply pressure gauge reading will decrease when performing this test procedure.
Test No. 1 - Check Valve No. 1
NOTE: Close all needle valve “A”, “B” and “C” and bleed valve
“A” and “B” on test kit.
Step 1 Insure shutoff No. 1 is open, shutoff No. 2 is closed.
Step 2 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.
Step 3 Open bleed valve “A” to bleed air from the high side.
Close “A” then open bleed valve “B” to bleed low
side. Close “B.”
Step 4 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.
Step 5 Close shutoff No. 1. Slowly open bleed “B” until differ-
ential gauge rises to 2psi and close. If the differential
reading does not decrease, record check valve
as “tight.”
Step 6 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.
Test No. 2 - Check Valve No. 2
Step 7 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.
Step 8 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.”
Step 9 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.
Step 10 Close shutoff No. 1, then slowly open bleed “B” until
differential gauge rises to 2psi and close. If the dif-
ferential 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.
NOTE: The assembly will fail both the fi rst and second check
valve tests above, if shutoff No. 2 leaks excessively. To test for
a leaky No. 2 shutoff, use the following procedure.
Test for Leaky No. 2 Shutoff
Step 11 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.
Step 12 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.
Step 13 If the differential gauge rises above 0 there is exces-
sive leakage at shutoff No. 2 and it must be replaced
to test the assembly.
007QT
Bleed Valve A
High
(red)
Bleed Valve B
(blue)
Bypass
(yellow)
RP-IS-007.indd 6 10/22/08 3:21:24 PM