In a hybrid drive system (A) for a work vehicle (F) with a mechanical drive train between an internal combustion engine (5) and a drive axle (2) as well as a parallel hydraulic hybrid module (H), which has a hydraulic unit (11) operable as a motor or pump,...

The hydraulic control unit (H) has seat valve (S) which is provided between pressure line (1) and working duct (32) of tipper cylinder (Z), attached with pressure source (P). The pilot-operated check valve (R) is provided in the unlocking terminals (17,17'...

The device (H) has a switching valve (40) e.g. 2/3 switching valve, provided superior to driver sides (37, 39) of working flow 2/2-pressure regulating seat valves (35, 38). A pressure balanced 2/2-control flow pressure regulating seat valve (42) is provide...

A solar power plant (K) comprises a field (F) having several solar generators (G) associated with a powerhouse (Z). The solar generators are connected to the electric motors (M) and to the powerhouse or a central power supply (S) over the copper power line...