Caleffi 553549A - AutoFill Automatic Boiler Fill Valve, Pressure Indicator, 1/2" SWT x 1/2" MNPT

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.

Specifications

Body: Brass
Cover: PA 66 GF 30
Seals: NBR
Suitable fluids: water, glycol solution
Max Percentage of Glycol: 50%
Max Working Pressure: 230 psi (16 bar)
Pressure Setting Range: 3–60 psi (0.2–4 bar)
Factory Setting: 15 psi (1.035 bar)
Indicator Accuracy: ±2 psi (±0.15 bar)
Max Working Temperature: 150°F (65°C)
Pressure gauge scale: 0-60 psi / 0-4 bar
Connections: 1/2" sweat inlet x 1/2" NPT female outlet
Pressure Gauge Outlet: 1/4 NPT

HCAL123235

Collection: Boiler Fill Valves

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553549A - Automatic Boiler Fill Valve with Pressure Indicator - 1/2" SWT x 1/2" MNPT