Fail-safe gas valve system with solid-state drive circuit

Details Fail-safe gas valve system with solid-state drive circuit Fail-safe gas valve system with solid-state drive circuit

1997-06-27

2000-04-18

Lee, Kevin

Fluid handling

Processes

25112901, 137613, 361152, 361189, F16K 3102

Patent

active

060502819

ABSTRACT:
A solid-state fail safe gas valve system in which first and second gas valves are arranged in series in a gas passageway, the valves being actuatable by first and second solenoid operators respectively, the second operator requiring a voltage greater than the operating voltage supplied to the valve system to achieve actuation. The operators are separately energized through microprocessor controlled switches so that a capacitor connected across the second operator and its switch is pumped to a voltage above the supplied voltage by voltage induced by interrupted energization of the first operator.

REFERENCES:
patent: 4865538 (1989-09-01), Scheele et al.
patent: 5085574 (1992-02-01), Wilson

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