A four-way selector valve comprises a valve case connected with a first pipe, a separate chamber communicating with a second pipe, a first valve seat ring in communicating path between a connecting portion of a third pipe and a space of said valve case, a second valve seat ring in a communicating path between a connecting portion of a fourth pipe and said space, a moveable valve element assembly for alternating co-operation with said first and second valve seat rings, and a valve drive means connected to said moveable valve element assembly to at least selectively interconnect said first pipe either with said third pipe or said fourth pipe and simultaneously the remaining one of said third or fourth pipes with said second pipe, wherein first and second valve disks are pressed essentially in the direction of the axis of the associated valve seat ring in closing direction by remanent forces onto said first and second valve seat rings, and first and second cylindrical and hollow valves are moveable substantially in the direction of the axis of the associated valve seat ring into respective lifting engagement with said valve disks to obtain different interconnecting states between the four pipes.