Spool valve and pilot interface assembly
US4182369A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1977 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Oct 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87225
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Valve means associatable with free traveling spherical means are sealing engageable onto and wipable off of companion seats to selectively control flow. A spool permits selective movement of the head means to the seat means and selective engagement of the head and seat means upon shuttling. An interface assembly comprises means which are extendible to the spool and a piston head element within the housing and carried around an extension for travel along the extension in response to pressure variation. The piston head is shiftable in a first direction in response to fluid variation for travel along the extension for transfer of the spherical means within the piston from one camway to another camway without movement of the spool within the housing. The piston head is shiftable in a second direction in response to second pressure variation for interface with the spherical elements carried in the piston with a shoulder and carriage of the spool to shift the spool to another position to vary the fluid flow path through the spool valve. The apparatus may be used to manipulate, for example, a downhole safety valve between open and closed position in response to signal variation indicating…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.