Method and apparatus for maintaining a constant ratio of gases in a mixture subject to steady state and intermittent flow conditions
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
May 18, 1999
filing date -
May 18, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention reveals a gas mixing device which maintains constant gas ratios under both steady state and intermittent flow conditions, and reduces mixture errors inherent with multiple gauges by providing only one pressure gauge to read the inlet pressure at each inlet port. To accomplish its purpose, the device comprises a chamber defined by two opposing hollow core pistons, a downstream control valve, and an upstream delay valve. The control valve, assisted by one piston, opens and closes in response to the upper and lower operating pressure limits of a receiver. The delay valve, assisted by the other piston, closes after the control valve closes and opens abruptly only after a significant drop in pressure within the chamber, the result of the control valve having suddenly opened wide. A single pressure measuring assembly, rotatably mounted to the gas mixing device, communicates with each inlet port.
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