Caleffi 573 User Manual

USC

www.caleffi.com

CALEFFI

Backflow preventer with intermediate atmospheric vent

Installation, commissioning and servicing instructions

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 has been specifically certified to standards
CSA B64.3 and ASSE 1012.

Product range

ASSE

1012

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

38517.04

573 Series

Technical characteristics

Connections: 1/2”- 3/4” NPT female with union

Materials: Body: brass

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 and ASSE 1012

Filter: stainless steel
Check valve: PSU
Check valve stem: brass
Diaphragm: EPDM
Seals: EPDM

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1/2” SWT with union

SAFETY INSTRUCTION

This safety alert symbol will be used in this manual to draw attention to safety related
instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT!

YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY
RESULT IN A SAFETY HAZARD.

CAUTION: All work must be performed by qualified personnel trained in the

proper application, installation, and maintenance of systems in accordance
with all applicable codes and ordinances.

CAUTION: If the backflow preventer is not installed, commissioned and
maintained properly, according to the instructions contained in this
manual, it may not operate correctly and may endanger the user.

CAUTION: Make sure that all the connecting pipework is water tight.

CAUTION: When making the water connections, make sure that the

backflow preventer connecting pipework is not mechanically over­stressed. Over time this could cause breakages, with consequent water
losses which, in turn, could cause harm to property and/or people.

CAUTION: Water temperatures higher than 100°F can be dangerous.
During the installation, commissioning and maintenance of the backflow
preventer, take the necessary precautions to ensure that such
temperatures do not endanger people.

CAUTION: In the case of highly aggressive water, arrangements must be
made to treat the water before it enters the backflow preventer, in
accordance with current legislation. Otherwise the valve may be
damaged and will not operate correctly.

Leave this manual for the user.

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