Instructions

ManualsBrandsCaleffi ManualsCombo Pressure Valves1/2" 573 Backflow Preventer and AutoFill Combination (Sweat x NPT)

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

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

38517.03

Installation, commissioning and servicing instructions

Technical characteristics

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

1/2” SWT with union

Materials: Body: 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)

Medium: water

Certified to: CSA B64.3 and ASSE 1012

USC

www.caleffi.com

CALEFFI

573 Series

ASSE

1012

Summary of content (6 pages)

PAGE 1
CALEFFI 38517.03 www.caleffi.com Backflow preventer with intermediate atmospheric vent 573 Series 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.
PAGE 2
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.
PAGE 3
VENT Flow rate graph Δp (psi) (psi) 20 20 (bar) 1 10 10 0.5 15 50 10 5 3 20 10 5 2 1 0.5 2 0.3 Cv = 0.
PAGE 4
Installation The Caleffi 573 series backflow preventer with atmospheric vent must be installed in accordance with the diagrams contained in this instruction manual taking into account all the applicable Codes and Regulations. Before installing a Caleffi 573 series backflow preventer, the system must be thoroughly flushed to remove impurities or any debris which may have accumulated during installation. Failure to remove dirt or debris may affect performance and the manufacturer’s guarantee.
PAGE 5
Installation diagram S/N BACKFLOW PREVE Series: 573 Sizes: 1/2” - 3/4” Heating system application VENT Vent Drain Floor Series: 573 Sizes: 1/2” - 3/4” S/N BACKFLOW PREVE Air gap VENT MAINS SUPPLY Field testing installation Backflow preventer 573 series Downstream test cock BACKFLOW PREVE MAINS SUPPLY Upstream test cock Series: 573 Sizes: 1/2” - 3/4” Upstream Y-strainer shut-off valve S/N Inlet test cock VENT 5 Downstream shut-off valve
PAGE 6
Field testing procedure 1) Check operation of the discharge. When inlet water pressure drops to atmospheric, the valve must open the vent port and discharge the contained amount of water in the valve body. a. -close shutoff valves upstream and downstream. b. -open the upstream test cock The water contained in the body must be discharged, indicating that the diaphragm has opened the vent port. 2) Check for tightness of the internal second check valve.