| 摘要 |
PURPOSE:To set up plural pieces of unit rotary valves in series, by installing a rotary valve stem, having two feed flow passages and a return flow passage being free of slidable rotation, inside an outer cylinder which has two feed ports and a return port. CONSTITUTION:An outer cylinder 4 is provided with two feed ports 9 and 10 leading to a hydraulic actuator each and a return port 22 leading to a tank. A rotary valve stem 5 is provided with two feed flow passages 13 and 14, capable of selectively interconnecting these feed ports 9 and 10, and a return flow passage 15 capable of selectively interconnecting the return port 4 and these two feed ports 9 and 10. A hydraulic feed and return block 21 is possible to be installed in the outside of a unit rotary valve 1 in series, and a feed port 22 is interconnected to an intake port 8 while a return port 23 to the return port 11, respectively. |
