Relief valve, 1 1/4", thread internal DU146-11/4A

The DU146 differential relief valve maintains the pressure generated by the pump in heating systems at a constant level and reduces the noise caused by the water flow, especially due to the flow throttling by the radiator valves. Due to its function of releasing the feed water, it increases the temperature of the water returning to the boiler, and thus reduces boiler corrosion caused by water condensation from flue gases. In the supply temperature control systems to the outside temperature, with closed radiator valves, it ensures constant water circulation through sensors located on the supply conduit. In addition, with gas circulating heaters, it ensures - even with closed radiator valves - a minimum circulation water flow.
The valve used in heating systems with forced