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Braukmann Automatic bypass and differential pressure valve for installation in district heating systems, DU146M

Braukmann Automatic bypass and differential pressure valve for installation in district heating systems, DU146M

The automatic bypass and differential pressure valve controls water flow in the heating circuit according to the water pressure across it and is used...

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
Port connection internal threads
Maximum operating pressure 16 bar
Differential pressure setpoint range 0,05 ... 0,5 bar
Max. media temperature 130 oC
Materials

Unpolished brass housing, untreated brass spring bonnet and brass valve disc, high-quality synthetic material adjuster knob, stainless steel spring, EPDM seals

Additional Descriptions
  • Maintain minimum flow through a boiler
  • Minimises flow noise
  • Hinders boiler corrosion
  • Full metal hosing for higher temperatures and differential pressures - suitable for district heating installations
  • Differential pressure finely adjustable
  • Presetting accessible directly
  • Without differential pressure indicator
  • No external controls required
pH-range 8 ... 9,5
Differential pressure setpoint fixed 0,2 bar

Tuotteet

Product Type Product description
Port diameter
Volumetric flow
Products

DU146M-3/4A

with internal threads Rp 3/4"

3/4 inch 3 m3/h

DU146M-11/4A

with internal threads Rp 1 1/4"

1 1/4 inch 10 m3/h

Accessories and replacement parts

Spare parts

Image Description Product Type Downloads
Valve insert, 3/4" 0900311  
Valve insert, 1 1/4" 0900312