초록 ▼

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 i

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.

대표청구항 ▼

[ What is claimed is:] [18.]18. A method of reducing ratio errors in an intermittently flowing mixture, comprising the steps of:causing a control valve positioned between a flow passage and an outlet to open;permitting the pressure in said flow passage to drop significantly; andresponsive to signifi

[ What is claimed is:] [18.]18. A method of reducing ratio errors in an intermittently flowing mixture, comprising the steps of:causing a control valve positioned between a flow passage and an outlet to open;permitting the pressure in said flow passage to drop significantly; andresponsive to significantly dropped pressure,causing a delay valve, positioned between said flow passage and at least one flow orifice, to suddenly open.