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ES1597 REV A.
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NOTE: This is a three-valve test kit procedure. Your local water purveyor should be consulted for acceptable test procedures. This
procedure is to be used on a stand-alone double check valve (DC), the mainline DC of a double check detector, and/or the bypass DC
of a standard (Type 1) double check detector. See Figure 9 for a schematic of the test setup.
TEST SETUP:
Flush test cocks (TC) (#1, #2, #3 & #4). Close shut-off valve #2. All TCs should be closed.
CHECK VALVE #1:
1. Close all valves on test kit.
2. Connect the high side hose to TC #2 and the low side hose to TC #3. Open TC #2 and TC #3.
3. Open vent valve “C” and high “A” on the test kit to bleed air from the high side of the kit. Close high “A” valve and then open low “B” valve to bleed
the low side. Close low “B” valve.
4. Record the gauge reading. It must be a minimum of 1.0 psid to pass. Close TC #2 and TC #3.
CHECK VALVE #2:
1. Move the high side hose to TC #3 and the low side hose to TC #4. Open TC #3 and TC #4.
2. Open vent “C” valve. Then open high “A” and bleed air from the high side of the kit. Close high “A” valve, and then open low “B” valve and bleed
the low side of the kit. Close low “B” valve.
3. Record the gauge reading. It must be a minimum of 1.0 psid to pass. Close TC #3 and TC#4. Remove hoses and drain test kit.
4. Slowly open shut-off valve #2 to restore water flow.
LEAKING #2 SHUT-OFF VALVE:
The following test will expose a leaking #2 shut-off valve.
1. Both shut-off valves should be open. Make sure all valves on test kit are closed. Connect the high “A” hose to TC #2 and the low “B” hose to TC
#3. Open TC #2 and TC #3.
2. Open the high “A” valve and vent “C” valve to bleed air from high side of gauge. Open low “B” valve to bleed air from low side of gauge. Close valves
“A”, “B” and “C” on test kit.
3. Connect the vent hose to TC #4. Open TC #4.
4. Close shut-off valve #2. The differential gauge needle should read at least 1.0 psid.
5. Open the high “A” valve and vent “C” valve. This will put back pressure on check valve #2.
6. Close TC #2.
If gauge is steady, then shut-off valve #2 is holding tight. However, if gauge drops to zero psid, then shut-off valve #2 is leaking. If the gauge
rises then the #2 shut-off valve is still leaking, but is under back-pressure from a downstream source.
TESTING PROCEDURE FOR SINGLE CHECK ON DCDA TYPE 2 BYPASS:
Note: The first check of the mainline valve is also the first check of the bypass assembly and the test results for the first mainline check
should be recorded as the first check of the bypass assembly. If the local water authority requires a second test for the first check, perform
the test again and record the results. The second check is the single check on the bypass line. (See page 10 for test cock locations)
7. Flush water through the bypass line test cocks to eliminate foreign material.
8. To test the bypass single check, connect the “high” side hose to the first test cock on the bypass line (upstream of single check valve). Hold the
“low” side hose level with the gauge.
9. Close the inlet shut-off valve on the mainline and bypass line. The single check valve must hold at least 1.0 psid.
WRAP UP:
CLOSE ALL TEST COCKS. OPEN #2 SHUT-OFF VALVE. DRAIN GAUGE.
V.
TESTING PROCEDURES
