| 摘要 |
Valves are associated and integrated inside a body C. A steering valve includes two cylinders A and B, concentric with the steering shaft D. The cylinder A rolls conjointly with the shaft. The valve controls the direction of the fluid circulation in the cylinders which effect the steering. The safety valve includes two pistons P1, P2 and a spring S, and makes the control easier of the steering, in an occasional lack of fluid pressure (pump damage, fluid leak, cut of the shaft strap, engine stop). A progression valve includes a cylinder and the piston PV. It operates by means of the vacuum effect TV, produced in the engine air admission of the vehicle, controlling the return of the piston P1 in a progressive way, from a certain speed of the said vehicle.
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