Adjustable gas mixing valve
US4085766A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Apr 15, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87121
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gas mixing valve including a hollow piston slidably lodged within a sleeve. Openings are formed in the piston wall in adjustable alignment with inlet ports in the sleeve, the longitudinal spacing between the openings being substantially equal to the longitudinal spacing between their respective inlet ports. Longitudinal piston movement causes the inlet ports to be progressively blocked, the ratio between the effective unblocked portions of the ports remaining substantially constant. A pressure responsive means such as a diaphragm controls the longitudinal piston position so as to vary the effective portions of the inlet ports inversely to the pressure within the sleeve and piston. The variance in pressure drops across the inlet ports due to changes in the flow rate of the inflowing gases is thereby limited without altering the mixing ratio. In the preferred embodiment the circumferential spacing between the inlet ports is unequal to the circumferential spacing between their respective piston openings, permitting the mixing ratio to be altered by rotating the sleeve about its longitudinal axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.