Proportioning brake valve with dual area secondary piston
US4660894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1986 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Apr 3, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T15/046
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A dual circuit brake valve includes a relay piston (50) having primary (82) and secondary (84) areas which are normally communicated to the pressure level at the primary outlet or delivery port (18). The relay piston (50) responds to a pressure differential across the relay piston to control communication to the secondary outlet or delivery port (22). A control mechanism (92) is responsive to a control signal to vent the secondary area (84) to thereby establish a differential area across the relay piston (50), so that the relay piston (50) will establish a pressure level at the secondary outlet or delivery port (22) which is a predetermined fraction of the pressure level at the primary outlet or delivery port (18).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.