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APPARATUS FOR MIXING GASES

  • US 3,727,627 A
  • Filed: 07/15/1970
  • Issued: 04/17/1973
  • Est. Priority Date: 07/15/1970
  • Status: Expired due to Term
First Claim
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1. Apparatus for the controlled mixing of gasses from separate pressurized gas circuits for delivery through a common flowpath, including the combination of pressure balance means to establish a substantially equal gas pressure in a downstream segment of each circuit, the pressure balance means including first control valve means controlling pressure in the downstream segment of the gas circuit and second control valve means controlling pressure in the downstream segment of the other gas circuit, valve operating means opening and closing the first valve means while conjointly closing and opening the second valve means responsive to a differential in pressure between the gasses in said downstream segments of the gas circuits to vary the pressures in said downstream segments for reducing said pressure differential to establish an equal pressure balance in said downstream segments, and mixing valve means to mix the gas from each downstream segment into said common flowpath, said mixing valve means including means forming a mixing chamber in communication with said common flowpath, means forming a pair of orifices each communicating between a respective one of said downstream segments and with said mixing chamber, means forming a pair of valve elements each adapted for movement within a respective one of said orifices to control the gas flow area thereof, and means to conjointly move said valve elements with respect to said orifices to reciprocally vary said flow areas to vary the ratio of the gas mixture.

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