Pressure activated emergency/temporary seal
US5071139A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/914
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pressurizable seal assembly provides a temporary seal which allows continued operation of a device, for example a pump, when the primary seal is removed for repair or replacement. The seal assembly includes a seal housing having a selectively pressurizable annular chamber with an open inner circumference surround the shaft of the device. An annular seal member is disposed in the annular chamber at the inner circumference thereof, and is actuable by pressure in the chamber to selectively sealingly engage the shaft. When the rotary shaft device has a single primary seal, the pressurizable seal may be provided between the stationary housing and the primary seal. When the primary seal of the rotary shaft device is a tandem seal, the pressurizable seal assembly may be disposed between the first and second primary seals of the tandem seal. The seal housing may be two-piece construction to facilitate its installation on and removal from the rotary shaft. In order to maintain the chamber at a predetermined pressure, a fitting may be provided which may be adapted to be attached to shop air pressure. In an alternative embodiment, an accumulator may be provided to maintain relatively consta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.