Air brake system with pressure holding valve
US4119351A · kind A · utility
6Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Feb 17, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/778
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle air brake system includes spring set air released parking brakes to which air is supplied through a pressure holding valve which maintains the air chambers of the parking brakes at a predetermined pressure even though the air brake system may be at operating pressures substantially lower than the predetermined pressure. When the air pressure in the air brake system falls below operational levels, the pressure holding valve responds to release the air from the parking brake chambers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.