Fluid mixing apparatus with progressive valve means
US5095950A · kind A · utility
Inventor
Key dates
| Filing date | Apr 16, 1991 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Apr 16, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86549
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for combining fluids having a piston assembly which controls both the flow rate and the mixture ratio. The piston assembly is carried in a housing having two circular inlet ports and an outlet or mixing chamber. The housing and piston assembly also define first and second piston chambers. A first passageway permits the communication of the dominant gas port and the one piston chamber and a second passageway similarly permits the communication of the mixing chamber and the other piston chamber. The relative pressures in the first and second piston chambers influence the axial position of the piston which controls flow rate. Rotation of the piston controls the mixture ratio. A gate portion of the valve element attached to the piston stem is angled. The angled gate portion and circular inlet ports provide a progressive valving, which minimizes "hunting" of the apparatus when used with a control means in a feedback loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.