Hydraulic control valve
US4320780A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Oct 27, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86638
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Control valve in which the reaction torque is created firstly by hydraulic reaction means and secondly by resilient means to provide for a second gradient of reaction torque; the invention consists in a control valve having a star-shaped rotor rotatably mounted in a disc chamber of a stator to define notably with a constituting member of that chamber several working chambers, the arms of said star-shaped rotor being of unequal lengths to provide for a first gradient of reaction torque, as known per se, and the improvement consisting in that the member is rotatable with respect to a surrounding intermediate member of said stator and that resilient means are located between members to provide for a second gradient of reaction torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.