Function
The backflow preventer with atmospheric vent is designed to protect
drinking water systems from the return, caused by backsiphonage or
backpressure, of contaminated fluids.
The Caleffi 573 series Is certified by ICC-ES to be in compliance with
the International Plumbing Code (IPC), International Residential Code
(IRC), Uniform Plumbing Code (UPC), and standards ASSE 1012-
2009, and CSA B64.3-94. Additionally, it is also certified by ICC-ES
to be in compliance with standard NSF/ANSI 372-2011, Drinking
Water System Components – Lead Content Reduction of Lead
in Drinking Water Act, California Health and Safety Code 116875
S.3874, Reduction of Lead in Drinking Water Act.
Product range
573 series backflow preventer with atmospheric vent
size 1/2”- 3/4” NPT female threaded connection with union
size 1/2” sweat connection with union
Backflow preventer with intermediate atmospheric vent
38517.05
Installation, commissioning and servicing instructions
Technical characteristics
Connections:
1/2”- 3/4” NPT female with union
1/2” SWT with union
Materials: Body:
low lead brass
Filter:
stainless steel
Check valve:
PSU
Check valve stem:
brass
Diaphragm:
EPDM
Seals:
EPDM
Maximum working pressure:
175 psi (12 bar)
Maximum working temperature:
210°F (99°C)
Emergency back pressure temperature:
250°F (121°C)
Medium:
water
Certified to:
CSA B64.3-94 and ASSE 1012-2009
NSF/ANSI 372-2011, Drinking Water System Components-Lead Content
Reduction of Lead in Drinking Water Act, California Health and Safety
Code 116875 S.3874, Reduction in Drinking Water Act, certified by
ICC-ES, file PMG-1360.
1
ASSE 1012
US
C
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CALEFFI
573 Series
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