Valve system with differentiated flow rates to be combined into batteries

A modular system to form valve batteries, comprising a plurality of valve units to be variously packed in side by side relationship to form the battery, each valve unit having a face on which outlets for users appear and, on opposite lateral mating sides of which through ducts appear which are intended for juxtaposing and connecting with corresponding ducts of units disposed in side by side relationship, each unit having valve means for controlled connection between the through ducts and the respective outlets, the valve units being made with a generally parallelepiped shape, the sizes of the mating sides being substantially constant for all units and the thickness of each unit intended as the distance between sides varying on varying of the maximum flow rate of the specific valve unit, thereby enabling a direct coupling between valve units having different maximum flow rates.