Fluid handling – Systems – Flow path with serial valves and/or closures
Reexamination Certificate
2004-11-27
2008-11-18
Lee, Kevin L (Department: 3753)
Fluid handling
Systems
Flow path with serial valves and/or closures
C137S487500, C250S297000, C250S297000
Reexamination Certificate
active
07451782
ABSTRACT:
The present invention relates to a flow path control valve capable of preventing a back flow of a fluid by maintaining inner pressure of a valve chamber constant. An object of the present invention is to provide a flow path control valve, which can rapidly and accurately control a flow path for a working fluid and also prevent a back flow of a working fluid without an additional check valve, thereby reducing the size of the product. A flow path control valve of the present invention for achieving the object comprises a housing formed with a valve chamber that can be in fluid communication with an inlet and an outlet; an opening/closing member installed movably within the valve chamber for moving between an opening position and a closing position to open or close a passage between the inlet and the outlet; an elastic member installed within the valve chamber to bias the opening/closing member toward the closing position; and a solenoid installed at a side of the housing to electromagnetically moving the opening/closing valve. A side of the opening/closing member is formed with a pressure equilibrium hole for causing the valve chamber to be in fluid communication with the inlet. A bypass tube is provided to discharge a fluid, which has been introduced into the valve chamber through the pressure equilibrium hole, to the outlet.
REFERENCES:
patent: 2666451 (1954-01-01), Ray
patent: 3030981 (1962-04-01), Chatham et al.
patent: 4387878 (1983-06-01), Zukausky
patent: 5333643 (1994-08-01), Gilchrist et al.
patent: 5413308 (1995-05-01), Hayes
patent: 5687759 (1997-11-01), Tan
Birch & Stewart Kolasch & Birch, LLP
Lee Kevin L
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