Drain valve, 1 1/4 inch, female thread DU146-11/4A

Differential pressure relief valve DU146 maintains the pressure generated by the pump in heating systems at a constant level and reduces noise caused by water flow, especially due to throttling by radiator valves. Thanks to its function of releasing supply water to the return, it increases the temperature of the water returning to the boiler, thereby reducing boiler corrosion caused by condensation of flue gases. In temperature control systems with outdoor temperature sensors and closed radiator valves, it ensures constant water circulation through the sensor located on the supply line. Furthermore, with circulating gas heaters, it ensures - even with closed radiator valves - a minimum flow of circulating water.
Valve used in heating systems with forced circulation:
with a three-