Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Reexamination Certificate
1999-11-04
2001-04-03
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
C417S405000, C418S206100
Reexamination Certificate
active
06209564
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for adjusting pressure difference in a valve fed with two fluids of different pressures to assure feeding of one of the fluids of lower pressure.
2. Description of the Related Art
A faucet generally includes a hot water inlet and a cool water inlet. Inlet pressure and flow of cool water and hot water vary in response to required output condition (e.g., temperature and output rate of mixed water). When incoming waters of different pressure meet with each other, feeding of water (generally the hot water) of lower pressure is stopped by the cool water of higher pressure and thus cannot be outputted. Thus, water of lower pressure must be outputted before output of water of higher pressure to assure feeding of the former, yet a waste in water is inevitable. In addition, output of water of lower pressure is impossible if the pressure difference is too large. Gas leakage occurs if the fire for heating water is ignited by water pressure, as ignition is impossible.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a device for adjusting pressure difference in a valve fed with two fluids of different pressures to assure feeding of one of the fluids of lower pressure and to precisely control mixing ratio between the two fluids before output.
A pressure difference adjusting device in accordance with the present invention is provided for a valve of the type having two inlets for two fluids of different pressures. The pressure difference adjusting device includes two rotatable elements that mesh with each other and that are mounted in a meeting area of the two fluids and thus driven by the fluids. Since the elements mesh with each other, rotation of the elements results in a siphon effect to the fluid of lower pressure such that the incoming fluids can be outputted at an optional mixing ratio.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2873889 (1959-02-01), Mori
patent: 2903008 (1959-09-01), Abbadessa
patent: 4015828 (1977-04-01), Miles
patent: 4032391 (1977-06-01), Moked et al.
patent: 5012837 (1991-05-01), Zepp
patent: 5156301 (1992-10-01), Hassell et al.
patent: 5588088 (1996-12-01), Flaman
Bacon & Thomas PLLC
Hepperle Stephen M.
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