Kelly valve
US4303100A · kind A · utility
16Cited by
11References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1978 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | Dec 18, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/106
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved kelly valve of a type wherein a flexible inner valve body closes the valve passageway responsive to the pressure of a gaseous control fluid contained within a sealed chamber and opens the passageway responsive to exterior pressure of drilling fluid or of tools being passed through the valve. The improvements enhance the operating life of the flexible member and simplify the valve structure and assembly and disassembly procedures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.