| 摘要 |
The device has a displacement cylinder (6) with a piston (7) between first and second chambers (11, 12) connected by control oil lines to a 4-way valve. Feed and return control oil lines are each divided into two parallel branches, two redundant 4-way valves are arranged in the parallel branches and seat valves are arranged between the connections (14,15) and the 4-way valves. |
