Low dead space ring
US4792118A · kind A · utility
14Cited by
7References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1987 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Jun 18, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K5/0673
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball valve includes a ball member rotatable in a valve chamber and cooperating with a pair of opposed seal assemblies. Each seal assembly comprises a support ring and disc spring having a resilient seal member interposed therebetween. A normally occuring void in the valve chamber is filled through use of a pair of dead space rings. These dead space rings are formed of a rigid, low friction material that does not substantially increase the torque required to rotate the ball member. In addition, the rigid material prevents cold flow of the material into the fluid passageway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.