Valve disc and drive shaft assembly
US5297778A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1993 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Jan 5, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49423
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A butterfly valve disc has a circular cross-section bore for receiving the end of a drive shaft which engages with a member non-rotatably located in the bore. The member is polygonal and preferably formed with twelve sides and edges, the edges biting into the internal surface of the bore to prevent rotation. The member preferably is of harder alloy than the disc to resist wearing and is formed with a slot extending perpendicularly to the plane of the disc to receive a corresponding tongue formed at the end of the shaft. This arrangement allows a small degree of play so that if the disc is subjected to pressure on one side and therefore bends, the torque required to open the valve is not increased. Alternatively wherein the disc (or another component) is not subject to such pressure the member may be integrally formed with the shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.