7
EN
3.4 Repair kits
Repair kits are available and make it possible to replace the specific defective part on the BA backflow preventer. The kit consists
of: one upstream valve assembly (1), one downstream valve assembly (2), one relief valve assembly (3).
3
2
1
L2
Ø
D
H1
H3
H2
W
L1
Backfl ow
preventer
part no.
DN
D
V
L1
L2
H1
H2
H3
W
L
Replace-
ment
part no.
mm
‘‘
mm mm mm
mm
mm
mm mm
kg
149B7000
15
1/2
32
122
201 168.5
103
65.5
53
1.2
149B1391
149B7001
20
3/4
32
122
201 168.5
103
65.5
53
1.2
149B1391
149B7002
25
1
40
157
252
238
156
82
76
2.7
149B1393
149B7003
32 1 1/4 40
157
252
238
156
82
76
2.7
149B1393
149B7004
40 1 1/2 50
220
336 303.5 202.5 101
115
6.5
149B1395
149B7005
50
2
50
220
336 303.5 202.5 101
115
6.5
149B1395
L2
Ø
D
H1
H3
H2
W
L1
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
Summary of Contents for SOCLA BA BM
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