Fluid control and shut off valve
US5100100A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1990 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Sep 12, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7759
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved control and shut off valve assembly is disclosed. The preferred valve assembly provides sufficient forces to overcome biasing forces so as to provide adequate shut off at a leakage rate of less than 10.sup.-9 std cc/sec of He with an atmospheric differential of Helium applied across the valve seat of the assembly, and precise control of the flow rate, all as a function of a single electrical control signal. In accordance with another aspect the valve seat is made from a material softer than the valve seat engagement means so that the seat is coined by the valve seat engagement means when first used so as to insure tight tolerances for sealing the valve passageway during the shut off mode. Finally, in accordance with yet another aspect of the invention, the valve assembly is constructed with no separate parts within the flow path so as to maintain a clean passageway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.