Butterfly valve having improved sealing characteristics
US5118078A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | May 16, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/24
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fully sealing butterfly valve throttles flow rates through a flow channel and completely ceases flow. A throttle plate rotates into a close position and then moves axially to seat against a seal. The axial movement directly corresponds to rotation of an actuator shaft to improve valve control for the entire range of throttle plate movement from a full open position to a seal position. Additionally, the present butterfly valve employs a self-centering throttle plate adapted to float within the valve central bore. The throttle plate adjusts its positioning about an annular seal to achieve an effective seal entirely around its circumference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.