Installation Guide

5
Customer Service [phone]
backflow.apollovalves.com
ES1602 REV A.
BFMMRP4ASBF
III. TROUBLESHOOTING
SYMPTOM CAUSE CORRECTIVE ACTION
Relief valve continuously discharges during no-
flow condition.
1. #1 check valve fouled with debris.
2. #2 check valve fouled with debris coupled
with a back-pressure condition.
3. #1 check poppet stem not moving freely in
guide (or #2 check poppet during a back-
pressure condition
1. Inspect and clean seat disc and seat
2. Inspect and clean seat disc and seat.
3. Inspect for debris or deposit on poppet
stem or guide.
Relief valve discharges continuously during flow
and no-flow conditions.
1. Relief valve fouled with debris.
2. Damaged diaphragm (allows water to pass
through from inlet to zone).
3. Sensing passage to inlet side of diaphragm
plugged.
4. #1 check poppet stem not moving freely in
poppet guide.
1. Inspect and clean relief valve seat disc and seat.
2. Replace diaphragm.
3. Inspect and clean passage in cover and body.
4. Inspect for debris or deposits on poppet
stem or guide.
Relief valve discharges intermittently in a
“spitting” action during no-flow condition.
1. Pressure fluctuations or water hammer
from supply.
1. Eliminate or reduce supply pressure
fluctuations.
Relief valve does not open during test No. 1.
1. #2 shut-o valve not closed completely.
2. Test equipment improperly installed.
1. Close #2 shut-o valve or inspect for
possible through leakage. Recheck test
procedure.
#2 check valve fails to hold back-pressure.
1. #2 shut-o valve not closed completely.
2. #2 check valve fouled with debris.
3. #2 check poppet stem not moving freely
in guide.
1. Close #2 shut-o valve or inspect for
possible through leakage.
2. Inspect and clean seat disc and seat.
3. Inspect for debris or deposits on poppet
stem or guide.
Pressure dierential across #1 check valve is low
during field test No. 3 (does not meet 5 PSID
minimum).
1. #1 check valve fouled with debris.
2. Upstream pressure fluctuations causing
inaccurate gauge reading.
3. #1 check poppet stem not moving freely
in guide.
1. Inspect and clean seat disc and seat.
2. Eliminate pressure fluctuations.
3. Inspect for debris or deposits on poppet
stem or guide.