Emergency portion for a brake control valve
US4113319A · kind A · utility
5Cited by
8References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1976 |
| Grant date | Sep 12, 1978 |
| Priority date | — |
| Expiry date | Dec 10, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T15/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An upgraded railway freight car brake control valve device comprises a novel emergency valve portion that embodies therein a plurality of simple and inexpensive poppet valves and a spool-type valve which valves replace yet perform the same functions heretofore performed by more expensive slide-type valves which slide valves, and the flat seats upon which they slide as they are shifted from one position to another, in their manufacture require a considerable amount of accurate machining thus increasing the cost of the brake control valve device of which they are an important part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.