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- The automatic filling unit is a device consisting of a pressure reducing valve with compensating seat, an inlet filter, a shut-off valve 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 stable at a set value, automatically filling up with water as required. This product has the characteristic of being pre-adjustable, which means that it can be adjusted at the required 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. A pre-assembled version is also available, complete with upstream backflow preventer.
Caleffi AutoFill™ Automatic Filling Valve, Pre-Adjustable, Series: 553, 1/2 in Nominal, MNPT x FNPT, 230 psi, 150 deg F, Brass Body, NBR Seal, 4-13/16 in W, Import
- Anti-scale with visual system pressure setting indicator
- Complete with manual shut-off valve, strainer and check valve
- 3 to 60 psi setting pressure range
- 15 psi Preset outlet pressure
- PA 66 GF 30 cover
- 0 to 60 psi/0 to 4 bar pressure gauge scale
- Suitable fluids: Water, glycol solution
- Maximum percentage of glycol: 50%
- Body MaterialBRASSDomestic / ImportImportEnd StyleMNPT x FNPTNominal Size1/2 inPressure Rating230 psiDimensions4-13/16 in WManufacturerCaleffiManufacturer #553542ASeries553Softgoods MaterialNBR SealSub-brandAutoFillTemperature Rating150 deg FTypePre-Adjustable