the description relates to a device for the regulation of the amount of a medium in a heating or cooling system , comprising a combined valve , which in one and the same valve housing includes one part for pressure difference regulation and one part for flow limitation , the flow being limited in a stepless , adjustable way , i . e . the device obtaining an adjustable kvs - value . also , the chosen kvs - value can be limited by a cone , which always can operate with its complete stroke length .