Ball valve
US3949965A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1973 |
| Grant date | Apr 13, 1976 |
| Priority date | — |
| Expiry date | Nov 9, 1993 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K11/0873
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A small ball valve for chemically active materials is provided which does not require the strength of metal parts and which permits the use of brittle material such as glass or ceramic as well as materials such as fluorocarbon polymers and polytetrafluoroethylene which are resistant to the action of chemically active fluids. A free-floating construction is provided without requiring a stem packing gland and permitting the stem to be integral with the ball. Identical sealing rings are provided with clamping screws which press the sealing rings inward against the ball and outward against the openings in the valve body, the diameter of the valve stem being smaller than the opening in the sealing ring and clamping screw therefor so that the portion of the ball surrounding the valve stem may also float freely under the sealing means with the seal around the ball stem being against the ball itself instead of against the valve stem. For reinforcement of the valve body or to permit the use of the valve when the controlled fluid is under high pressure a metal reinforcing ring may be fitted around the valve body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.