| 摘要 |
<p>A pilot-operated valve device having a plurality of valves for controlling the operation of a hydraulic device such as a hydraulic cylinder, wherein the whole device is compactly formed such that a plurality of valves are mounted in small mounting space without causing them to be interfered be each other. The valve device can further be easily modified to meet a plurality of hydraulic devices. The valve device comprises a cuboidal valve housing (10), first and second pump ports (11, 12) extending in parallel and horizontally in upper portions near the opposite sides in the valve housing and communicating with the hydraulic pump, a tank port (13) formed in the lower central portion of the valve housing, a pilot tank port (25) formed in the central portion of the valve housing and communicating with the drain tank, first and second ports (14, 15) formed in different positions of the upper surface of the valve housing and extending vertically downward in the housing to communicate with pressure chambers of the hydraulic device, a plurality of valves (19, 20, 23, 24) inserted in a plurality of valve holes formed in the valve housing to open or close these ports, and pilot valves (31, 35) for controlling the supply of pressurized oil for pilot pressure to these valves.</p> |
