Piston actuated well safety valve
US4161219A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1978 |
| Grant date | Jul 17, 1979 |
| Priority date | — |
| Expiry date | Feb 27, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a well safety valve for controlling the fluid flow through a well conduit in which the valve has a housing and a valve element movable in the housing between an open and closed position for controlling the flow through a passageway in the housing and means for biasing the valve element to a closed position, the improvement in piston means for moving the valve element into an open position. A piston is telescopically mounted in the housing, is controlled by fluid from the well surface, and is offset from the passageway. The piston has a small cross-sectional area for reducing the effect of hydrostatic forces acting on the piston whereby the valve may be used at greater depths in the well. The piston has a diameter smaller than the diameter of the valve passageway for ease of manufacture and less expense. Preferably the piston is positioned within the wall of the housing, and may be a solid cylinder or may be tubular one outside diameter with a second lower section of a greater outside diameter. Preferably, the piston is attached to and actuates a tubular member which controls the movement of the valve closure member and has a cross-sectional area less than the cross-sectional are…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.