Valve with metallic bellows valve stem seal
US4976403A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1990 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Jan 16, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18976
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fire-resistant valve 10 with a valve stem 40 mounted for linear motion through a valve stem bore 41 in the valve body 12 and connected to a valve element 20 by a connection means which effects movement of the valve element 20 between its valve open and its valve closed positions in response to axial linear motion of the valve stem 40. The valve includes a valve stem actuator 46 and a valve stem seal assembly comprising a primary seal in the form of an axially extensible and compressible metallic bellows 50 disposed in sleeved relation to the valve stem 40. The bellows is connected at one end by an annular weld 41 to the valve stem and at its other end by an annular weld 52 to the valve body in encircling relation to the valve stem and valve stem bore so as to effect a fluid-tight, gas-tight seal therebetween. A packing structure mounted in the annulus between the valve stem and wall of the valve stem bore provides a secondary valve stem seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.