Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1976-04-15
1978-04-25
Cline, William R.
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
137 98, 1376372, F16K 1100
Patent
active
040857662
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.
REFERENCES:
patent: 2032641 (1936-03-01), Thomas
patent: 2486017 (1949-10-01), Furkert
patent: 3233987 (1966-02-01), Hepburn
patent: 3416570 (1968-12-01), Kervin
patent: 3675683 (1972-07-01), Chapou
patent: 3884259 (1975-05-01), Hosmer et al.
Lichte Leo James
Weigl James
Becker William G.
Bourns Inc.
Cline William R.
Ware Paul H.
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