DU145-3/4E

Honeywell DU145 Automatic bypass and differential pressure valve

The DU145 automatic bypass and differential pressure valve is used to maintain a constant differential pressure in a heating system. It reduces flow noise in a system, particularly as thermostatic radiator valves are closed. The boiler return temperature is raised and this reduces corrosion caused by flue gas condensation. In addition, when radiator valves are closed it also maintains flow over the temperature sensor on the boiler to ensure proper operation of external temperature compensation controls. On gas-fired water heaters it guarantees a minimum flow circulation when thermostats or radiator valves are closed.
For pump-driven warm water heating systems, e.g.:
On heating systems with three-way or four-way mixing valves, or
on gas-fired hot water circulation heating systems.
Materials: Brass housing and fittings, plastic sping bonnet assembly and valve disc, stainless steel spring, EPDM seals
Body pattern: angle
Medium type: water or water-glycol mixture according to VDI 2035
Max. media temperature: 110C
Max. operating pressure: 3bar
Differential pressure setpoint range: 0,1...0,6bar
For system capacities up to approx. 70 kW (60.000 kcal/h)


Product description: no
Port connection type: internal threads