Automatic bypass and differential pressure valve DU145

Description

Automatic bypass and differential pressure valve Resideo 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 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.

Supplied with externally threaded connections 3/4".

• Application: 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.
• Controlled Media: Water-Glycol Mixture according to VDI 2035
• Connection Size: 3/4 in
• Connection Type External Thread
• pH Value 8
• Differential Pressure (Max) 0.6 kPa, 0.6 bar
• Differential Pressure (Min) 0.1 kPa, 0.1 bar
• Media Temperature (Max)110°C
• Operating Pressure (Max) 3 bar, Operating Pressure (Min) 0.1 kPa
• Bonnet Material: High Grade Synthetic
• Product Features: 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.