Protection valve device for spring parking brake systems
US4726628A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Nov 28, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T15/42
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A protection valve device for a spring parking brake control system has a pipe bracket for connection in a normally pressurized brake pipe, the pipe bracket having connected thereto a protection valve, a charging reset valve and a charging check valve. The protection valve has a chamber at one side of a piston normally pressurized by pressure at a spring parking brake cylinder port and monitors the spring parking brake cylinder pressure to vent fluid from the brake pipe to automatically cause an emergency brake application if such pressure indicates a spring parking brake is applied. The charging reset valve prevents the venting of brake pipe fluid during charging of the brake pipe and spring parking brake system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.