Caleffi 553542A - AutoFill Boiler Feed Valve - 1/2" 

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 valve. 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 backflow 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.

Features

• IN connection: 1/2" FNPT, union
• OUT connection: 1/2" MNPT
• Maximum upstream pressure: 230 psi
• Medium temperature range: 41–150 degrees F
• Setting: 15 psi
• Adjustment pressure range: 3–60 psi
• Pressure gauge scale: 0–60 psi (0–4 bar)
• Material: brass

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