Watts SOCLA BA BM Installation Manual page 7

EN
L1
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).
L2
Backfl ow
DN D
preventer
part no. mm ''
149B7000 15 1/2
149B7001 20 3/4
149B7002 25 1
149B7003 32 1 1/4
149B7004 40 1 1/2
149B7005 50 2
4. Troubleshooting
PROBLEM
1. Rapid discharge of water through the
relief valve followed by normal operation
2. Continuous discharge of water
through the relief valve in the course of
normal operation
3. Continuous discharge of water
through the relief valve in safe mode
(normal fl ow or no fl ow)
V L1 L2 H1 H2
mm mm mm mm mm
32 122 201 168.5 103
32 122 201 168.5 103
40 157 252 238 156
40 157 252 238 156
50 220 336 303.5 202.5
50 220 336 303.5 202.5
Pressure fl uctuation in the upstream
water supply network
The relief valve is dirty or damaged
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
L1
L2
Replace-
H3 W L
ment
mm mm kg part no.
65.5 53 1.2 149B1391
65.5 53 1.2 149B1391
82 76 2.7 149B1393
82 76 2.7 149B1393
101 115 6.5 149B1395
101 115 6.5 149B1395
POSSIBLE CAUSE
1
ACTION
None
Clean or replace the relief valve module
a. Clean or replace the upstream valve
b. Clean or replace the relief valve
module
c. Clean or replace the downstream
valve
2
3
7