Watts Industries BA BM Serie Manual Tecnico página 5

Table A
DN 15
Outlet Ø mm 32
• Before putting the device into operation, the upstream piping and BA-device shall be de-aerated
through test cock 10, 11 and 12 (see drawing 1).
Testing
In compliance with national instructions a BA-unit shall be tested periodically, in most countries
on an annual basis. Watts Industries offers test kits with pressure gauge and hoses (reference:
catalogue "Maintenance kits").
The testing shall be confirmed by means of the appropriate certification.
Observations
Observation
1. Short-time discharge of water through
relief valve followed by normal operation.
2. At normal operation continuous water
discharge through relief valve.
3. In discharge mode continuous water
discharge through relief valve.
Maintenance instructions (see drawing 1)
Disassembly
• Remove cover (3) from main body (1) by unscrewing bolts (4).
• Remove retainer (5).
• Remove first check valve module (6) with the use of a screwdriver as handle.
• Remove relief valve module (8) either by a M10 bolt or by pushing the module upwards with a flat
tool through the air-gap (9).
• Remove second check valve module (7) with the use of a screwdriver as handle.
Note: disassembly of relief valve body (2) from the main body (1) is not foreseen.
Assembly
• Mount second check valve module (7) into its bore in main body (1).
• Mount the relief valve module (8) into its location in the relief valve body (2).
• Mount first check valve module (6) into its bore in main body (1).
• Position the retainer (5) between first & second check valve (6 & 7) and on top of the relief valve
module (8). Only one position is possible.
• Mount the cover (3) and tighten the bolts (4).
Material specifications
• Main body:
• Relief valve body:
• First & second check valve module:
20 25 32
32 40 40
Possible reason
Pressure fluctuation in the water supply.
Relief valve polluted or damaged.
a. First check valve polluted or damaged.
b. Seal relief valve piston polluted or
damaged.
c. Second check valve polluted or damaged.
DZR brass CW602N.
polymer PA (co-polyamide).
polymer POM.
BAcKFlOw PREvEnTERS BA BM
40 50
50 50
Action
None.
Cleaning or replacement of relief valve module.
a. Cleaning or replacement of first check valve
module.
b. Cleaning or replacement of relief valve
module.
c. Cleaning or replacement of second check
valve module.
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