Isolating valves
US4108199A · kind A · utility
7Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Mar 11, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87981
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A butterfly valve having two interconnected synchronously movable discs spaced apart axially in the direction fluid flow. In order to ensure that fluid is not retained between the discs when the valve is closed there is at least one drainage outlet which communicatingly connects the space between the discs and the valve exterior.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.