Low interflow hydraulic shuttle valve
US6318400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1999 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Dec 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2569
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The hydraulic shuttle valve has two coaxial supply ports and a transverse function port to direct fluid coming from alternative control sources to a blow out preventor (BOP). The valve includes a moveable shuttle with opposing tapered metal sealing surfaces to alternatively engage opposing coaxial metal valve seats. The shuttle moves back and forth into alternative sealing engagement depending on which supply port has the highest fluid pressure. As the shuttle moves from engagement with one metal seat to engagement with another, there is low or no interflow from one supply port to the other, thus maximizing the amount of fluid directed to the function port. An obtuse metal point is formed on each metal valve seat which comes into contact with a respective outward tapered sealing surface on the shuttle. Repeated movement of the shuttle to and fro displaces a portion of the metal point into a recessed chamfer. This displacement of metal insures a good metal to metal seal between the shuttle and the metal valve seat. This displacement of metal is also known as "progressive coining." In alternative embodiments, the low interflow hydraulic shuttle valve with metal to metal seals can inc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.