(under subclass 625) Devices comprising four way valves having an inlet port, an outlet port and two intermediate ports, the valve being selectively movable into two positions, in one position the inlet port being connected to the first intermediate port and the second intermediate port being connected to the outlet port, and in the other position the inlet being connected to the second intermediate port and the first intermediate port being connected to the outlet port.
SEE OR SEARCH THIS CLASS, SUBCLASS:
309+, for reversing valves, regenerative furnace type.
625.29, for this structure when used in dividing and recombining structures.
