Valve construction kit for the production of valve clusters

A valve construction kit for the production of valve clusters, said valve clusters comprising plate-like valve units arranged in a row in a direction at right angle to a principal plate plane of each valve unit said valve units each possessing a core module having a core housing through which a plurality of valve ducts extend at right angle to the respective principal plate plane and which contains at least one movable valve spool, said valve units also possessing a frame-like encasing element, separate from the core module, said encasing element surrounding the core module in the principal plate plane and defining an outline of the respective valve unit, said encasing element and the core module being fixed together by mutually matching interface means, the construction kit containing a plurality of said core modules and a plurality of frame-like encasing elements of different types, said frame-like encasing elements of different types differing from each other at least in their material properties, wherein the mutual interface means permit assembly of valve units for different purposes of use.