Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1991-04-16
1992-03-17
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
13762517, G05D 1103
Patent
active
050959506
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.
REFERENCES:
patent: 1949300 (1934-02-01), Fitter
patent: 3297051 (1967-01-01), Church
patent: 4765356 (1988-08-01), Hallberg
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