Pressure balanced seal
US4557489A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1984 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Mar 23, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/928
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pressure balanced mechanical seal, especially adaptable for use in a swivel in an oil well drilling arrangement comprising a pair of relatively rotatable seal rings constructed of silicon carbide or tungsten carbide each received in a cavity defined by a cylindrical and a radial wall in the respective housing for the ring with the inner cylindrical surface of each exposed to high pressure, high temperature drilling mud and with means to communicate drilling mud to the outer cylindrical surfaces thereof, and means for balancing the axial forces on the rings and to insure sufficient axial forces for perfecting the seal. Tensional and compressive forces on the rings are minimized insuring reasonable life to the seal, far in excess of that in the conventional packings now used in the oil drilling system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.