there is described a pressure regulating valve for a refrigerating plant , having a slider member that can be moved relative to a guide by means of a drive device , with variable throttle resistance being created between the guide and the slider member . the purpose of such a valve is to be able to control refrigerant over a relatively large throughput range , and the valve should be able to be manufactured inexpensively . for that purpose , the slider member and the guide co - operate in two sections of their movement relative to one another according to different valve principles .