| 摘要 |
An earthmoving vehicle (1) has an operating arm (2) raised and lowered by a hydraulic system (3), which has a drain line (5), and at least one actuator (6) connected to the operating arm (2); the actuator defines a variable-volume chamber (11) connectable to the drain line (5) to lower the operating arm (2); and the oil discharged from the chamber (11) flows through a proportional safety valve (22) adjacent to the actuator, and a distributor valve (16) which is driven to allow free flow to the drain line (5), so that lowering of the operating arm (2) is controlled solely by the proportional safety valve (22). <IMAGE>
|
