Metering valve
US4941447A · kind A · utility
18Cited by
11References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Feb 21, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86759
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A metering valve, simultaneously controlling a plurality of flow paths with a single poppet movable into and out of engagement with a valve seat in a duty cycle operation has the sealing surfaces of the poppet and seat formed with an accurately flat surface finish to minimize leakage when the valve is closed. The seat surface is formed with recessed areas to reduce the area of contact with the poppet surface to reduce pull-off force while maintaining adequate contact area to dissipate the closing impact forces which are further minimized by controlling the flow of fluid from between the opposed surfaces during valve closure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.