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Pre-adjustable Filling Units and Backflow Preventer
Series 553 - 573

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.
 
 
 
 
 
 
Quick Reference Guide:
ReferenceTitleType
 Catalog 
pdf
Caleffi Hydronics Solutions List Price (pg 9)
            pdf
 Drawing 
zip
Series 553: AutoFill Boiler Feed Valve
            dwg
  
zip
Series 553: AutoFill Boiler Feed Valve
            dxf
  
zip
Series 573: Backflow Preventer and Autofill Combination
            dwg
  
zip
Series 573: Backflow Preventer and Autofill Combination
            dxf
 Information Sheet 
0.29 MBpdf
AutoFill Automatic Filling Valve
            pdf
 Product AutoFill boiler feed valve            link
  Backflow preventer            link
  Backflow preventer and AutoFill combination            link
  Boiler Trim Kit            link
 Technical Brochure 
pdf
Pre-adjustable Filling Units and Backflow Preventer
            pdf
 
For more information navigate to Products > Catalog.
 

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Last update 04/27/2010 D.Lgs. 231 | Disclaimer | Credits | Copyright | Legal information
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