Pressure vacuum relief valve
US4133346A · kind A · utility
26Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Jun 6, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/778
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pressure control valve assembly includes a valve housing having a spring loaded, resilient valve element with reversely curved conical surfaces thereon one of which is seated on a fixed, annular pressure relief seat by a first spring element and the other of which is seated against a spring biased ball check valve that controls flow through a central opening in the valve element defining a vacuum relief path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.