7
EN
4. Troubleshooting
PROBLEM
POSSIBLE CAUSE
ACTION
1. Rapid discharge of water through the
relief valve followed by normal operation
Pressure fl uctuation in the upstream
water supply network
None
2. Continuous discharge of water through
the relief valve in the course of normal
operation
The relief valve is dirty or damaged
Clean or replace the relief valve module
3. Continuous discharge of water through
the relief valve in safe mode (normal fl ow
or no fl ow)
a. The upstream valve is dirty or
damaged
b. The piston seal of the relief valve is
dirty or damaged
c. The downstream valve is dirty or
damaged
a. Clean or replace the upstream valve
b. Clean or replace the relief valve module
c. Clean or replace the downstream valve
3.4 Repair kits
Repair kits are available and make it possible to replace the specific defective part on the BA backflow preventer
L2
Ø
D
H1
H3
H2
W
L1
Backfl ow
preventer
part no
DN
Spare part references
mm
Kit A
Kit B
Kit C
Kit E
Kit F
Kit G
Kit H
2231150
15
22416020377 22416020393 22416020359 22416020333 22416020310 22416020315
2236704
2231250
20
2236705
2231350
25
22416030377 22416032393 22416032359 22416020333 22416032310 22416032315
2236706
2231450
32
2236707
2231550
40
22416050377 22416050393 22416050359 22416020333 22416050310 22416050315
2236708
2231650
50
2236709
L2
Ø
D
H1
H3
H2
W
L1
C
B
A
E
E
E
H
H
G
F
Backfl ow
preventer
part no
DN
D
V
L1
L2
H1
H2
H3
W
L
mm
‘‘
mm mm mm
mm
mm
mm mm
Kg
2231150
15
1/2
32
122
201 168,5
103
65,5
53
1,2
2231250
20
3/4
32
122
201 168,5
103
65,5
53
1,2
2231350
25
1
40
157
252
238
156
82
76
2,7
2231450
32 1 1/4 40
157
252
238
156
82
76
2,7
2231550
40 1 1/2 50
220
336 303,5 202,5 101
115
6,5
2231650
50
2
50
220
336 303,5 202,5 101
115
6,5
Spare part kit :
A -
First check module :
O’ring + O’ring for
cover + 4 cover screw
B -
Second check module :
O’ring + O’ring
for cover + 4 cover screw
C -
Relief valve module :
O’ring + one M10
screw for an easy remove of the relief valve module
+ O’ring for cover + 4 cover screws
E -
Test cock
F -
Air gap kit
G -
Relief valve body kit
H -
Sockets and seals kit
Summary of Contents for BA BM
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