Empty-load valve device
US4844554A · kind A · utility
13Cited by
1References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 26, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | May 26, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/1893
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An empty-load valve device has a single housing competing coaxially a load sensing push rod, a load sensing piston, a ratio piston, a ratio valve and a spring for retracting the push rod to a normal position. The load sensing push rod actuates the ratio piston to open an equalizing valve to fill an equalizing volume from a control valve and to permit the ratio piston to limit brake cylinder pressure upon sensing an empty car.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.