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コントロールユニット Apollo Valves RP4AのPDF インストレーション、オペレーション、メンテナンスマニュアルをオンラインで閲覧またはダウンロードできます。Apollo Valves RP4A 16 ページ。 Reduced pressure principle (rp) backflow preventer
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III. TROUBLE SHOOTING
SYMPTOM
1.
Relief valve continuously
discharges during no- ow
condition.
2.
Relief valve discharges
continuously during ow and
no- ow conditions.
3.
Relief valve discharges
intermittently in a "spitting"
action during no- ow condition.
4.
Relief valve does not open during
test No. 1.
5.
#2 check valve fails to hold
backpressure.
6.
Pressure di erential across #1
check valve is low during eld
test No. 3 (does not meet 5 PSID
minimum).
Customer Service (704) 841-6000
CAUSE
a.
#1 check valve fouled with debris.
b. #2 check valve fouled with
debris coupled with a
backpressure condition.
c.
#1 check poppet stem not
moving freely in guide (or #2
check poppet during a
backpressure condition).
a.
Relief valve fouled with debris.
b. Damaged diaphragm (allows
water to pass through from inlet
to zone).
c.
Sensing passage to inlet side of
diaphragm plugged.
d. #1 check poppet stem not
moving freely in poppet guide.
a.
Pressure uctuations or water
hammer from supply.
a.
#2 shut-o valve not closed
completely.
b. Test equipment improperly
installed.
a.
#2 shut-o valve not closed
completely.
b. #2 check valve fouled with debris.
c.
#2 check poppet stem not
moving freely in guide.
a.
#1 check valve fouled with debris.
b. Upstream pressure uctuations
causing inaccurate gauge
reading.
c.
#1 check poppet stem not
moving freely in guide.
www.apollovalves.com
BFMM RP4A SBF
CORRECTIVE ACTION
a.
Inspect and clean seat disc and
seat
b. Inspect and clean seat disc and
seat.
c.
Inspect for debris or deposit on
poppet stem or guide.
a.
Inspect and clean relief valve seat
disc and seat.
b. Replace diaphragm.
c.
Inspect and clean passage in
cover and body.
d. Inspect for debris or deposits on
poppet stem or guide.
a.
Eliminate or reduce supply
pressure uctuations.
a.
Close #2 shut-o valve or inspect
for possible through leakage.
b. Recheck test procedure.
a.
Close #2 shut-o valve or inspect
for possible through leakage.
b. Inspect and clean seat disc and
seat.
c.
Inspect for debris or deposits on
poppet stem or guide.
a.
Inspect and clean seat disc and
seat.
b. Eliminate pressure uctuations.
c.
Inspect for debris or deposits on
poppet stem or guide.
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