Watts Industries BA BM Serie Manual Tecnico página 3

Air vented
from BA No
device?
Yes
Leakage out of Occasionally
Yes
relief valve?
Drops out of
relief valve?
No
Continuous
relief valve?
Leakage at
other position
Yes Fitting work?
at BA than
relief valve?
No
Waterhammer
Rattling noise? Yes
No
Inlet pressure
No water flow? Yes less than 1 bar
No
BA device
polluted
Yes
repeatedly
after service
No
High pressure
loss over BA Yes
device?
Venting procedure: Open (min. 5 sec.) and close in sequences
from inlet to outlet side the ball valves of the test / drain ports
Fluctuation of
Yes supply pressure
splashing
more than 0,2 bar?
No No
Less than 1 drop /
Yes
5 minutes?
No
More than 1
flow out of
F.e. Presence
of fast closing
Yes
present? tap or solenoid
No
at Qn?
No
Attention!
Hole size of strainer:
Strainer BS010 < 0,3mm
Yes
installed? BM015/020 < 0,4mm
BM025/032 < 0,5mm
BM040/050 < 0,5mm
No
In accordance to EN12729 (Qmin at 100 Kpa):
DN10 => 0,86 m3/h, DN15 => 1,9 m3/h
DN20 => 3,4 m3/h, DN25 => 5,3 m3/h
DN32 => 8,7 m3/h, DN40 => 13,6 m3/h
No
No
Difference
No
pressure over
1st check
valve more
drop / 1
than 0,4 bar?
minute?
In case not
measurable,
do both
actions.
Yes
No
valve
Yes
Polluted
strainer?
BA installed in
wrong flow
direction?
No
DN50 => 21,2 m3/h
Contact Watts Industries Netherlands.
Vent air.
Install check
Yes valve in front
of BA device.
Yes Normal.
Clean relief
valve or
Yes
replace relief
valve
completely.
No
Clean 1st
check valve or
replace.
Fix fitting work.
Replace BA
device
completely.
Install
waterhammer
arrestor
directly behind
BA device.
Increase inlet
pressure.
Yes
Clean strainer.
No
Correct flow
direction.
Install strainer.
Review whole
installation.