Ball valve
US4676480A · kind A · utility
22Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1986 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Jan 6, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K5/0647
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball valve comprising a valve body defining inlet and outlet sections, and a ball with a calibrated through-port. The valve further comprises a stem to rotate the ball between open and closed positions, a seal to insure a fluid tight closure of the valve when the ball is in the closed position, and a mechanism for retracting the seal. This seal retracting mechanism is selectively coupled to the stem, and the mechanism eliminates all contact, when the valve is in the open position, (i) between the ball and the seal, and (ii) between the stem and the seal retracting mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.