| 摘要 |
Control unit for opening cut-off valves of extension arms in machines, especially in front bucket loaders, characterized in that the control inputs (14) of the cut-off valves (13) situated in the hydraulic system of servomotors (1) of the extension arm fitted with a main distributor (3) which controls movements of the extension arm are connected with the hydraulic system, preferably with fixed pressure, supplied from a separate pump (11) via an auxiliary distributor (10) supplying oil to the control inputs (14) of the cut-off valves (13) while the extension arm is descended.<IMAGE>
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