Directional control valve apparatus
US6186172A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Aug 6, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87241
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A directional control valve system is provided in conjunction with a hydraulic actuator, using a meter-in flow control valve that is simple in structure to permit pressure fluid to be fed into a first and a second chamber of the hydraulic actuator. The directional control valve system includes a meter-in flow control valve 1 for establishing and blocking fluid communication of a pump port with an outlet port 12, a first and a second load checking valve 2 and 3 that is in fluid communication with the outlet port 12, and a meter-out flow control valve 4 for establishing fluid communication of one of a first and a second actuator port 72 and 74 at an output side of the first and second load checking valves 2 and 3 with a tank port 71, and has an arrangement that permits the first and second load checking valves 2 and 3 to be held in a closed state with pressure fluid. The system provides feeding a first and a second chamber 99a and 99b with pressure fluid from the first or second actuator port 72 or 74 notwithstanding a simple configuration of the meter-in flow control valve 1 to establish and block fluid communication between the outlet port 12 and the pump port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.