Adjustable venturi mixing valve assembly

A venturi mixing valve assembly, comprising:

• an open-ended first tubular section adapted to be coupled to a supply of a first gas at one axial end of said first tubular section, said first tubular section having a sleeve defined therein wherein an annular channel open on one end thereof is defined between said sleeve and an inner surface of said first tubular section, said first tubular section having an outer wall with an inlet defined in said outer wall, said inlet in fluid communication with said annular channel and adapted to be coupled to a supply of a second gas;
• an open-ended second tubular section defining an annular region with a plurality of holes and a venturi region coupled to said annular region, said annular region circumscribing at least a portion of said sleeve of said first tubular section and sealed to said sleeve;
• and
• an open-ended tubular ring threadably coupled to an outer surface of said first tubular section and threadably coupled to an outer surface of said second tubular section, wherein rotation of said tubular ring in a first direction causes said first tubular section and said second tubular section to move axially towards one another, and wherein rotation of said tubular ring in a second direction opposing said first direction causes said first tubular section and said second tubular section to move axially away from one another.

A venturi mixing valve assembly, comprising:

• an open-ended first tubular section adapted to be coupled to a flow of a first gas at one axial end of said first tubular section, said first tubular section having a sleeve defined concentrically therein wherein an annular channel open on one end thereof that faces away from said one axial end is defined between said sleeve and an inner surface of said first tubular section, said first tubular section having an outer wall with an inlet defined in said outer wall, said inlet in fluid communication with said annular channel and adapted to be coupled to a supply of a second gas;
• an open-ended second tubular section defining an annular sleeve region with a plurality of holes and a venturi region coupled to said annular sleeve region, said annular sleeve region circumscribing at least a portion of said sleeve of said first tubular section and sealed to said sleeve;
• and
• an open-ended tubular ring threadably coupled to an outer surface of said first tubular section and threadably coupled to an outer surface of said second tubular section, wherein rotation of said tubular ring in a first direction causes said first tubular section and said second tubular section to move axially towards one another to thereby increase said portion of said sleeve circumscribed by said annular sleeve region, and wherein rotation of said tubular ring in a second direction opposing said first direction causes said first tubular section and said second tubular section to move axially away from one another to thereby decrease said portion of said sleeve circumscribed by said annular sleeve region.