Hydopneumatic suspension

Hydraulic spring system cylinders (10,12) between vehicle structure and axle each link their cylinder (14,16) and ring (18,20) chambers (RC) to pressure reservoirs (26,28) with optional links to a source (42) of pressure and a tank (34) via valve assemblies assigned to the RC and having magnetic valves (64) with a tight seating and proportional valves (60) triggered electrically/hydraulically.