A liquid control valve (320) that is utilized in a liquid treatment system includes a valve body (322). The valve body includes a plurality of liquid ports (A, B, C D, E, F) and a plurality of annular flow cavities. A piston (328) which includes at least one annular flow passage and a longitudinal flow passage, is selectively movable within a bore (324) within the valve body responsive to operation of at least one motor. The piston is selectively axially positionable within the bore to enable liquid flow through a plurality of flow paths. The exemplary valve enables treatment material housed in an associated liquid treatment tank to undergo a regeneration cycle as a result of liquid flow though the valve, while the valve outlet port that is operable in a valve service condition to deliver treated liquid, is continuously not in fluid flow connection with any other port the valve during the regeneration cycle.