Patent ID: 7134945

Claim:
A Soda Blasting Apparatus ( 1 ) comprising: a. a pressure vessel ( 10 ), a pressure inlet line ( 200 ) in pressure communication interconnected by piping to a pass through pipe ( 400 ) to pressurize the pass through pipe ( 400 ) and the pressure vessel ( 10 ); the pressure vessel ( 10 ) having a pressure vessel top ( 11 ) and a pressure vessel interior ( 13 ); b. the pass through pipe ( 400 ) rigidly interconnected by piping, and in pressure communications, with a venturi ( 500 ); the venturi received by and in pressure communication with a blasting medium outlet ( 600 ) at a pressure vessel bottom ( 12 ); the blasting medium outlet ( 600 ) interconnected by piping and in pressure communication with a blasting medium outlet elbow ( 700 ) a hose and nozzle connected to the outlet elbow ( 700 ) to allow application of blasting medium to a surface; c. the pass through pipe ( 400 ) having a pass through pipe aperture ( 430 ) having a pass through pipe ID D7 ( 410 ); the venturi ( 500 ) having a venturi aperture ( 590 ) having a venturi aperture ID D6 ( 585 ) and a venturi diameter OD D3 ( 570 ); the blasting medium outlet ( 600 ) having a medium outlet ID D5 ( 650 ); the medium outlet elbow ( 700 ) having a medium outlet elbow ID D8 ( 750 ); the blasting medium outlet ID D5 ( 650 ) greater than the venturi diameter OD D3 ( 570 ); the venturi ( 500 ) movably received, at a venturi bottom ( 520 ) into the medium outlet ( 600 ); d. the venturi aperture ID D6 ( 585 ) diameter less than the pass through pipe ID D7 ( 410 ) diameter creating, when the nozzle is activated allowing flow of blasting medium, a pressure differential between the pass through pipe aperture ( 430 ) and the venturi aperture ( 590 ), from a resulting venturi effect, whereby the pass through pipe pressure Pa ( 480 ) is greater than venturi pressure Pb ( 575 ); e. the venturi ( 500 ) having a venturi top ( 510 ) and a venturi outer surface ( 525 ); at least one groove ( 530 ) at the venturi outer surface ( 525 ) from a point intermediate the venturi top ( 510 ) and the venturi bottom ( 520 ) to the venturi bottom ( 520 ); said at least one groove ( 530 ) allowing passage of blasting medium ( 70 ) from the pressure vessel interior ( 13 ) via the said at least one groove ( 530 ) resulting from the pass through pipe pressure Pa ( 480 ) being greater than venturi pressure Pb ( 575 ); the pressure differential urging the rigidly interconnected pass through pipe ( 400 ) and venturi ( 500 ) upward; the upward movement of the venturi ( 500 ) and at least one venturi groove ( 530 ), relative to the medium outlet ( 600 ), controllable and limited by movement limiting means ( 300 ) thereby allowing metering of the blasting medium ( 70 ) delivered to the hose and nozzle.