Multi-stage pressure regulator

Details Multi-stage pressure regulator Multi-stage pressure regulator

2008-03-11

2008-03-11

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

C137S505460, C137S599090, C137S601010, C137S601120

Reexamination Certificate

active

11132982

ABSTRACT:
A pressure regulator that has particular application for an anode input side of a fuel cell system to provide the desired large turn-down ratio. The pressure regulator includes at least two valves positioned in parallel where the first valve is smaller than the second valve. The first valve is opened and closed and the second valve is maintained closed at low flow rates. Once the flow rate is high enough, the first valve is maintained completely open, and the second valve is opened and closed to control the flow at high flow rates.

REFERENCES:
patent: 188740 (1877-03-01), Kipp et al.
patent: 853693 (1907-05-01), Healey
patent: 1706230 (1929-03-01), Hilger
patent: 2601745 (1952-07-01), Cruzan
patent: 3742972 (1973-07-01), Hughes
patent: 5048564 (1991-09-01), Gaiardo
patent: 5158107 (1992-10-01), Teay
patent: 5944257 (1999-08-01), Dietiker et al.

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