Two stage relief valve for master cylinder quick-fill chamber
US4860541A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7841
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A two stage relief valve for a quick-fill master cylinder (10). The two stage relief valve (54) has a ball (88) that is biased against a first seat (82) to control the flow of fluid from a quick-fill chamber (30) and a unitary structure (55, 74) which is biased against a second seat (70) to further control the flow of fluid from the quick-fill chamber (30). A first predetermined fluid pressure moves the ball (88) off the first seat (82) to allow fluid to escape from the quick-fill chamber (30). A second predetermined fluid pressure moves the unitary structure (55, 74) to allow additional fluid to escape and thereby limit the fluid pressure development in the quick-fill chamber (50).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.