| 摘要 |
<p>The precision control system is for hydraulic drives, particularly those on which an external load acts. It has hydraulically-operated two-way valves with seats. The two-way valves (1, 2) have hydraulically-operated throttle valves (45). The two-way valves control only the flow direction, and the throttle valves control only the fluid flow rate. They can be so coupled together that the two-way valves first move into the position selecting the flow direction, after which the throttle valves open.</p> |
