DCVA - Backflow test demonstration

DCVA Short Form Test Procedures
Gauge Set Up:
1. NIIO
2. Purge debris from assembly.
3. Install fittings into test cocks.
4. Connect compensating valve to the #2 test cock.
5. Connect high hose to the compensating valve
6. Close all valves on the gauge
7. Open #2 test cock.
8. Open high bleed to purge air from high hose.
9. When air is purged from high hose, close high bleed valve. (Pointer on gauge should be pegged.)
Tube Setup:
1. Connect Sight Tube to the #3 test cock
2. Open #3 test cock slightly to allow water to fill to sight tube above the #1 check valve.
3. Close #3 test cock.
Test #1:
1. Hold center of gauge even with the water line in the sight tube
2. Close #2 shut off valve then close #1 shut off valve
3. Open #3 test cock.
4. When the water stops rising in the sight tube, read the gauge and record the number. (A reading of 1 psid or greater is a good reading. A reading of less than 1 psid means the check valve
has failed and will need to be repaired.)
5. Close test cocks and go to Set Up #2
Set Up #2
1. Move sight tube from #3 test cock to #4 test cock.
2. Move compensating valve, while high hose is still connected, from #2 test cock to #3 test cock.
3. Open #1 shut off valve. (Do not open #2 shut off valve.)
4. Open #3 test cock.
5. Open high bleed valve to purge air from high hose
6. When air is purged from high hose, close high bleed valve. (Pointer on gauge should be pegged).
7. Open #4 test cock slightly to allow water to fill the sight tube above the #2 check valve.
8. Close #4 test cock.
Test #2
1. Hold center of gauge even with the water line in the sight tube.
2. Close #1 shut off valve,
3. Open #4 test cock.
4. When the water stops rising In the sight tube, read the gauge and record the number, (A reading of 1 psid or greater is a good reading. A reading of less than 1 psid means the check valve has failed and will need to be repaired.)