Counterbalance valve
US4244275A · kind A · utility
26Cited by
4References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1979 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | Jan 15, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7788
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic system for raising and lowering a load by means of a fluid motor includes a counterbalance valve which controls the flow of fluid to and from the motor. The counterbalance valve has a pilot operated metering orifice which passes fluid from the motor when the load is lowered and a compensator valve which maintains a fixed pressure differential across the metering orifice. This results in a fixed flow of fluid through the metering orifice when the load is lowered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.