Skip Ribbon Commands
Skip to main content

Braukmann Automatic bypass and differential pressure valvewith differential pressure indicator, DU145

Braukmann Automatic bypass and differential pressure valvewith differential pressure indicator, DU145

The automatic bypass and differential pressure valve controls water flow in the heating circuit according to the water pressure across it and is used to maintain a minimum flow rate through the boiler and...

Product Description

The automatic bypass and differential pressure valve controls water flow in the heating circuit according to the water pressure across it and is used to maintain a minimum flow rate through the boiler and to limit circulation pressure when other water paths are closed. A bypass circuit must be installed if the Boiler manufacturer requires one, or specifies that a minimum flow rate has to be maintained whilst the Boiler is firing. The use of automatic bypass valves becomes particularly important when heating systems include large numbers of thermostatic radiator valves (TRVs) - whilst the TRVs are open the automatic bypass valve remains closed, however, as the TRVs start to close, the automatic bypass valve starts to open maintaining the required water flow through the boiler. Using an automatic bypass valve is also likely to reduce noise in systems caused by excess water velocities. It also helps to reduce the corrosion caused by flue gas condensation as the boiler return temperature is raised.

Technical Properties

Medium type water or water-glycol mixture according to VDI 2035
Maximum operating pressure 3 bar
Differential pressure setpoint range 0,1 ... 0,6 bar
Max. media temperature 110 oC
Body pattern angle
Materials

Unpolished pressed brass housing and fittings, high-grade synthetic material sping bonnet and valve disc, stainless steel spring, EPDM seals

Additional Descriptions
  • Maintain minimum flow through a boiler
  • Minimises flow noise
  • Hinders boiler corrosion
  • Differential pressure finely adjustable using indicator scale
  • Presetting accessible directly
  • Setting vlaue is in meters water column
  • No external controls required
pH-range 8 ... 9,5
Differential pressure setpoint fixed 0,2 bar

Products

Product Type Product description
Port connection
Products

DU145-3/4A

Supplied with externally threaded connections 3/4"

external threads

DU145-3/4E

with internal threads G3/4"

internal threads

DU145-3/4B

with compression fittings for 22 mm copper pipe


external threads

Accessories and replacement parts

Accessories for DU 145-3/4 A

Image Description Product Type Downloads
Connection set, Solder connections for size 3/4" VST06-3/4B  

Accessories for DU 145-3/4 E

Image Description Product Type Downloads
Compression ring with backnut,support inserts have to be used for copper or soft steel pipe with 1.0 mm wall thickness. 3/4 x 18 mm ZS109M-3/4G  
Compression ring with backnut, support inserts have to be used for copper or soft steel pipe with 1.0 mm wall thickness. 3/4 x 22 mm ZS109M-3/4H  
Compression ring with backnut, support inserts have to be used for copper or soft steel pipe with 1.0 mm wall thickness. 3/4 x 18 mm with support insert (2 pcs each) ZS109M-3/4GS  
Compression ring with backnut, support inserts have to be used for copper or soft steel pipe with 1.0 mm wall thickness. 3/4 x 22 mm with support insert (2 pcs each) ZS109M-3/4HS