High pressure wear resistant pilot valve
US5771931A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86686
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A reciprocating sleeve type valve mechanism having a valve housing within which is located a cage element. A piston, movably positioned within the valve housing, accomplishes linear opening movement of a cylindrical seal sleeve with respect to spaced polymer seals within the housing. Closing movement of the seal sleeve is accomplished by a return spring. Sealing between the cage element and a wear resistant external ceramic liner of the seal sleeve is accomplished by a seal assembly having a centrally located elastomer seal ring with polymer backup wiper rings positioned on opposite sides thereof. The seal assembly provides a bearing and guiding function to stabilize the seal sleeve during its opening and closing movement and to wipe particulate from the sealing surface of the seal sleeve as well as to maintain efficient sealing with the seal sleeve as the valve is opened and closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.