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backflow.apollovalves.com
ES1595 REV A.
BFMMDC4S00
LEGEND
TEST VALVE
TEST COCK
WATER METER
TV NO. 1
TV NO. 2
“VENT” HOSE OPEN TO ATMOSPHERE
FOR ALL TESTS
(MAINLINE AND BYPASS DCV)
TV NO. 3
GAUGE
TC NO. 1
TC NO. 3
TC NO. 4
OUTLET SHUT-OFF
VALVE (MAINLINE)
CHECK VALVE NO. 2
CHECK VALVE NO. 1
INLET SHUT-OFF
VALVE (MAINLINE)
TC NO. 2
TC NO. 5
TC NO. 6
TC NO. 7
TC NO. 8
OUTLET SHUT-OFF
VALVE (BYPASS)
CHECK NO. 1 CHECK NO. 2
INLET SHUT-OFF
VALVE (BYPASS)
“LOW SIDE”
HOLD OPEN END AT SAME LEVEL AS
GAUGE DURING TESTING
“HIGH SIDE”
CONNECT TO:
TC NO. 2 FOR TEST NO. 1 (MAINLINE DCV)
TC NO. 3 FOR TEST NO. 2 (MAINLINE DCV)
TC NO. 6 FOR TEST NO. 1 (BY-PASS DCV)
TC NO. 7 FOR TEST NO. 2 (BY-PASS DCV)
FIGURE 6
IV.
TESTING PROCEDURES
V. TROUBLESHOOTING
SYMPTOM
CAUSE
CORRECTIVE ACTION
Check valve fails to hold 1 psid.
1. Shut-off valve not closed completely.
2. Check valve fouled with debris.
1. Close outlet shut-off valve or inspect for
possible through leakage.
2. Inspect and clean seat disc and seat.
