Cam means for ball valve seat rings
US4262691A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Jun 29, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6045
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball valve in which cams (82, 84) are mounted on the ball member (34) to engage spring biased seat rings (30, 32) and cam the seat rings to a retracted position at which the seat rings are retained. The ball valve has a removable cover plate (16) so that the ball member (34) and seat rings may be subsequently removed from the valve body (12) while the valve remains in-line. A removable stop (56) engages and blocks rotation of the ball member past its fully opened and fully closed positions and the cams (82, 84) engage the seat rings only after the stop is removed and the ball member is rotated past its normal stroke and beyond fully opened or fully closed positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.