| Body Material | : | Brass |
| Configuration | : | Horizontal or Vertical |
| Connection Type | : | FNPT |
| Dimensions | : | 9-1/8 in L |
| Domestic/Import | : | Import |
| Flow Coefficient (Cv) | : | 0.7 Cv |
| Lead-Free/Contains Lead | : | Contains Lead |
| Media | : | Water |
| Nominal Size | : | 1/2 in |
| Pressure Rating | : | 175 psi |
| Series | : | 573 Series |
| Temperature Rating | : | 41 to 150 deg F |
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.
Caleffi Automatic Filling Valve and Backflow Preventer, 573 Series, 1/2 in Nominal, FNPT Connection, Horizontal or Vertical Configuration, 175 psi Pressure, Media: Water, Flow Coefficient (Cv): 0.7 Cv, Brass Body, Lead-Free/Contains Lead: Contains Lead, 41 to 150 deg F, Dimensions: 9-1/8 in L, Domestic/Import: Import
- Automatic fast-filling - fast fills a hydronic system to set pressure then automatically shut-off the water feed, no levers to flip or buttons to push
- Maintains stable system pressure - automatically maintains system pressure setting with makeup water when the hydronic system pressure decreases due to air removal through automatic air vents or blowdowns of strainers or dirt separators
- Anti-scale polymer materials - prevents scaling on internal sliding surfaces, assuring stable pressure control and long operating life
- Built-in shut-off valve and check valve - allows isolation of system from supply to stop makeup water if desired, integral check valve prevents loss of system pressure if the supply water pressure drops below system pressure
- Pre-calibration - before charging the system, turn dial to desired system pressure with a screwdriver (factory pre-set to 15 psi), optional downstream pressure gauge allows for easy confirmation of set pressure
- AutoFill™ combo assembled with 573 FlowShield DuC-AV backflow preventer - the low-lead ASSE 1012 device prevents potential pollution of the supply water, the AutoFill™ combo saves installation time and reduces space requirements
