Watts 007M1DCDA - Manual (Page 4)

Printed in U.S.A.
RP/IS-007DCDA 0325 EDP# 1911335 © Watts Regulator Co., 1998
Watts USA website: www.wattsreg.com
Watts Canada website: www.wattscda.com
Test Procedure
Double Check Valve Assembly
Test Check Valve No. 1
Step 1: Ensure shutoff #1 is open, shutoff #2 is closed.
Step 2: Connect high side hose to test cock #3, low side to
test cock #2 and open both test cock #2 and test
cock #3.
Step 3: Open valve C, then open A to bleed air from the high
side. Close valve A, then open B to bleed low side.
Close valve B.
Step 4: Connect vent hose loosely to test cock #1. Open
valve A to vent air from vent hose. Tighten vent hose
at test cock #1, open test cock #1.
Step 5: Close shutoff #1. Slowly loosen hose at test cock #2
until differential gauge rises to 2 psi and retighten
hose. If the differential reading does not decrease,
record check valves as “tight”.
Test Check Valve No. 2
Step 1: Move the high side hose to test cock #4, low side to
test cock #3 and open both test cock #3 and test
cock #4. Remove vent hose from test cock #1, open
shutoff #1.
Step 2: Open valve C, then open valve A to bleed air from
the high side. Close valve A, then open valve B to
bleed lowside. Close valve B.
Step 3: Connect vent hose loosely to test cock #1. Open
valve A to vent air from the vent hose. Tighten vent
hose at test cock #1, open test cock #1.
Step 4: Close shutoff #1, then slowly loosen hose at test
cock #3 until differential gauge rises to 2 psi and
retighten hose. If the differential reading does not
decrease, record check as tight. Remove all hoses
and restore valve to original working condition.
Note: The assembly will fail both the first and second
check valve tests above, if shutoff #2 leaks excessively.
To test for a leaky #2 shutoff, use the following procedure.
Test for Leaky No. 2 Shutoff
Step 1: Connect the high side to test cock #1, low side to
test cock #4. Open test cock #1 and test cock #4.
Close shutoffs #1 and #2.
Step 2: Close valve C. Open valve A, then open valve B 1 ⁄ 2
turn, loosen hose at test cock #4 to remove air.
Retighten hose.
Step 3: If the differential gauge rises above 0, there is exces-
sive leakage at shutoff #2 and it must be replaced to
test the assembly.
Note: Product informaiton is subject to change with-
out notice and supersedes all previous publications.
Ball Type
Test Valves
(B)
Needle
Valve
(A)
Test Cock
No. 1
Test Cock
No. 2
(C)
Vent Hose
(Color - Blue)
Low Hose
(Color - White or Red)
Test Cock
No. 3