CALEFFI 573403A Dual Check Backflow Preventer 1/2" NPT

Function

The automatic filling valve is a device consisting of a pressure reducing valve with compensating seat, visual system pressure setting indicator, an inlet filter, anti-scale internal parts, a shut-off valve (round knob on bottom) and a Check ValveA valve that prevents backflow of water into the sump pit from the Discharge Pipe . .

It is installed on the water inlet piping in sealed heating systems, and its main function is to maintain the pressure of the system at a set value, automatically filling up with water as required.

The valve is pre-adjustable, meaning it can be set to the desired pressure value before the system charging phase.

After installation, during the filling or topping-off phase, the water feed will stop when the set pressure is reached. This valve fills 50% faster than other valves. There are no levers to flip or valve to close.

Pre-assembled with the 573 series backfl ow preventer, the AutoFill Combo features an atmospheric vent which is designed to protect drinking water systems from return flow, caused by back-siphoning or back pressure, of contaminated fluids. The 573 series has been specifically certified to standards CSA B64.3 and ASSE 1012.

The backflow preventer with atmospheric vent is designed to protect drinking water systems from the return, caused by backsiphonage or backpressure, of contaminated fluids.

Dual check continuous pressure backflow preventer with atmospheric vent. DZR low-lead brass body.

• Max working pressure: 175 psi
• Working temp range: 32? - 210?F
• Emergency backpressure temp: 250?F
• Certified to: ASSE 1012, CSA B64.3, NSF/ANSI 372, Low Lead Laws and listed by ICC-ES. Meets codes IPC, IRC & UPC for use in accordance with the U.S. and Canadian plumbing codes.