Fluid heater organization with improved flow control means

Claim 1

AN ORIFICE ASSEMBLY FOR CONTROLLIONG FLOW IN A TUBULAR FLUID HEATER COMPRISING A TUBULAR MEMBER PROVIDED AT THE EXTREMITY OF ONE OF ITS TWO ENDS WITH A RADIALLY OUTWARD EXTENDING FLANGE HAVING AN OUTWARDLY NARROWING TRANSVERSE SECTION, DISC MEMBER OVERLYING THE FACE OF SAID ONE END IN COMPLEMENTARY RELATION THERWITH AND HAVING AN ORIFICE COMMUNICATING WITH THE INTERIOR OF THE TUBULAR MEMBER, MERANS RELEASABLY RETAINING THE DISC IN PLACE INCLUDING A CIRCUMFERENTIALLY EXPANDABLE CLAMP MEANS DISPOSED ABOUT SAID FLANGE AND DISC AND HAVING AXIALLY SPACED SURFACES SNUGLY EMBRACING THE FLANGE AND DISC, AND MECHANICAL INDEXING MEANS FOR INDEXING THE DISC MEMBER HAVING AN ORIFICE OF PARTICULAR SIZE WITH THE TUBULAR MEMBER AND EFFECTIVE UNLESS PROPERLY INDEXED TO RETAIN THE DISC MEMBER SPACED FROM THE TUBULAR MEMBER SUFFICIENTLY TO PREVENT RECEIPT OF THE FLANGE AND DISC INTERMEDIATE THE AXIALLY SPACED SURFACES OF SAID CLAMP.