Twin face seal
US4900039A · kind A · utility
29Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Jul 27, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/929
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A redundant seal arrangement employs first and second face-type seal assemblies for sealing between a housing and rotary member. A drain passage communicates with an intermediate area disposed between the first and second seal assemblies. During normal operation, minute amounts of fluid migrate past the first seal assembly and communicate with the passage to the drain. Alternatively, if the first seal assembly fails, a drain valve closes or a restriction orifice is used so that the intermediate area is raised to essentially the working pressure and the second seal assembly seals against further migration of the working fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.