Watts SOCLA BA BM Installation Manual page 6

3. Maintenance and inspection of
installed backflow preventers
3.1 Testing kit
In accordance with
statutory regulations, BA backflow
preventers must be
inspected (once a year in most
countries) by an authorised
maintenance technician.
BA backflow preventers must
undergo compulsory annual testing
using test equipment conforming
to NF P43-018, such Watts or
equivalent (ref. 2234900M2).
This equipment must be checked at least once every two This equipment must be checked at least once every two
years.
3.2 Instructions for fitting/removal for maintenance purposes
Removal
A- Remove the cover (3) by unscrewing the screws (4).
B- Remove the spacer (5).
C- Remove the upstream valve (6).
D- Remove the relief valve module (8), using the M10 bolt
supplied in the kit.
E- Remove the downstream valve (7).
6
national
regularly
4
11
3
6
8
10
Key
13
1. Top cover
2. Pressure adjuster screw
3. Drain plug
1
4. Drain screw
5. Safety membrane
6. Compensation membrane
7. Filter 2
8. Cover seal
9. Strainer cover
10. Seal
11. Pressure test pipe
12. Operating membrane
13. Spring
14. Spring washer
9
15. Spring washer
3.3 Refitting instructions
Check and lightly re-grease the O-rings
• Install the downstream valve (7) in its seat in the main body (1)
• Install the relief valve module (8) in its seat in the relief body (2)
• Install the upstream valve (6) in its seat in the main body (1)
and arrange the fins at 45°
• Position the inner spacer (5) between the upstream and
downstream valves (6 and 7) and above the relief valve
assembly (8). There is only one possible position
• Fit the cover (3) and tighten the screws (4)
EN
5
7
12
15
14