Top entry ball valves with cam adjustable seats
US5117858A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Sep 30, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6045
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A top entry ball valve comprises a housing having an interior cavity sufficiently large to receive a conventional ball and conventional seat rings through an opening in the housing. After the ball/seat package has been inserted into the cavity, a cam arrangement is used to axially load the seat rings. The cam arrangement comprises a pair of circular cams, each having an undulating annular surface, which are disposed in the housing cavity adjacent one of the seat rings with the respective undulating annular surfaces of the cams being in closely adjacent facing relation to one another. After assembly of the valve, one of the circular cams is rotated relative to the other cam to vary the rotational positions of the undulating annular surfaces relative to one another thereby to vary the axial positions of the circular cams relative to one another and relative to the ball and seat rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.