If you want the maximum number of operational configurations from a basic number of interchangeable standard components, then check out the new range of spool valves from Mikrospin.
Directional control valves come in modular and monoblock forms. Modular types have four body sizes which can be banked up to 10 sections whilst monoblocks have five body sizes and from 1 to 6 sections. Flow rates are from 50 to 150l/min per section, with working pressures up to 375bar.
Most bodies can accommodate any one of 12 spool functions, which have various detent and spring options.