Operating Principle - Watts BA BM Manual De Instalación Y Funcionamiento

EN
Backflow preventer with verifiable
reduced pressure zone - BA BM
Type
General
Designed to protect drinking water supply networks against
the backflow of risk fluids up to category 4 according to
NF EN1717.
is designed to prevent any backflow of polluted
The device
water into the drinking water supply network as a result
of back pressure or back siphonage when the pressure
upstream of the device is lower than the pressure
downstream of it.
Fields of application
For systems liable to generate pollution risks:
• Sanitary networks: hospitals, laboratories,
dialysis centres, water treatment.
• Technical networks: heating, air conditioning, irrigation,
water dispensers.
• Fire suppression systems: sprinklers, fire hoses.
• Professional networks: industrial facilities,
surface treatment, chemical industry, agrifood.
• Temporary networks: water supply for trade fair stands,
festivals, exhibitions.
Note: The applications also depend on legislation in the
country of use. Please contact your national authorities
for further information.
Technical specifications
Type of fluid: drinking water
Operation: horizontal position
DN 15 to 50 mm, male/male connection
Maximum operating pressure: 10 bar (1 MPa)
Minimum inlet pressure: 1.5 bar (150 KPa)
Maximum operating temperature: 65°C
Standards - Approval
Conforms to the following standards: EN1717, EN12729
BELGAQUA
Kiwa UK-REG 4

1. Operating principle

The BABM backflow preventer with verifiable reduced
pressure zone includes:
• three zones: upstream, intermediate and downstream, each
equipped with a pressure measuring device.
• two independent check valves, separating the intermediate
zone.
• one automatic relief device connected to the intermediate
zone to restore it to atmospheric pressure in the event of a
failure.
This device is installed with a funnel with air gap.
Maintenance and accessibility of the internal components are
facilitated by the modular design of the replacement parts.
INTERMEDIATE CHAMBER
UPSTREAM
1st
VALVE
RELIEF VALVE
DOWNSTREAM
2nd
VALVE
FUNNEL
ACS
3