Pilot relay valve with load piston
US5261458A · kind A · utility
9Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Apr 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87225
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A relay valve for a fluid pressure braking system includes a relay piston and a load piston which is responsive to the pressure at the inlet port of the relay valve to exert a biasing force on the relay piston loading the latter against the inlet/exhaust valve. The biasing force is opposed by fluid pressure at the inlet port acting across the effective area of the inlet/exhaust valve. The biasing force is greater than the spring force holding the inlet/exhaust valve closed, so that the valve responds immediately to pressure signals transmitted through the control port of the relay valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.