Drill pipe tester valve
US4319634A · kind A · utility
21Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1980 |
| Grant date | Mar 16, 1982 |
| Priority date | — |
| Expiry date | Apr 3, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill pipe tester valve includes a spherical valve member supported from an upward facing surface of a housing so that downward forces exerted on the valve member in its closed position, due to fluid pressure in a string of pipe above the valve member, are transmitted substantially entirely to said housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.