Fluid operable valves
US4197873A · kind A · utility
8Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1978 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Feb 13, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88038
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid operable valve suitable for use in high temperature and pressure environments involving the flow of solids material, incorporates a main valve member and a pilot valve member co-operable with separate seats axially spaced apart in association with the inlet of the valve. The arrangement is such that in operation the pilot valve member is sequenced to close against its seat prior to the main valve member which is purged prior to closure by a gas to remove particles of material which might cause ineffective sealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.