Fuel nozzle

Claim 1

A DUAL-FLOW FUEL NOZZLE HAVING A HEAD END AND A FUEL DISCHARGE END, PRIMARY AND SECONDARY FUEL OUTLET PASSAGES IN SAID NOZZLE FOR DISCHARGING FUEL FROM SAID FUEL DISCHARGE END, A CYLINDRICAL SWIRL CHAMBER IN SAID HEAD END HAVING A CIRCUMFERENTIAL RESTRICTED FUEL DELIVERY SLOT IN THE BOTTOM THEREOF ADJACENT THE INNER WALL OF SAID CHAMBER IN FLOW COMMUNICATION WITH SAID PRIMARY FUEL OUTLET PASSAGE, SAID CHAMBER HAVING A TANGENTIAL FUEL INLET PASSAGE IN THE UPPER PORTION THEREOF FOR DISCHARGING FUEL TANGENTIALLY INTO SAID CHAMBER TO CREATE A VORTICAL FUEL FLOW IN SAID SWIRL CHAMBER, CONCENTRIC CYLINDRICAL FLOW DIVIDING MEANS IN SAID SWIRL CHAMBER SEPARATING FUEL DELIVERY FROM SAID INLET PASSAGE INTO SAID PRIMARY AND SECONDARY FUEL OUTLET PASSAGES, SAID FLOW-DIVIDING MEANS INCLUDING AN INNER CONCENTRIC CYLINDRICAL CHAMBER SPACED MATERIALLY INWARDLY FROM THE AFORESAID INNER WALL OF SAID SWIRL CHAMBER HAVING A PLURALITY OF FUEL DELIVERY OPENINGS THERETHROUGH, HAVING A VALVED PASSAGE THEREIN IN COMMUNICATION WITH SAID SECONDARY FUEL OUTLET PASSAGE, VALVE MEANS IN SAID VALVE PASSAGE OPENING DOWNSTREAM TOWARD SAID SECONDARY FUEL OUTLET PASSAGE, A PISTON IN SAID CONCENTRIC CYLINDRICAL CHAMBER, MEANS CONNECTING SAID PISTON TO SAID VALVE MEANS, SPRING MEANS IN SAID CYLINDRICAL CHAMBER BIASING SAID PISTON FOR YIELDABLY CLOSING SAID VALVE MEANS TO CONTROL FUEL DELIVERY TO SAID SECONDARY FUEL OUTLET PASSAGE, A CYLINDRICAL FILTER ELEMENT SURROUNDING SAID CONCENTRIC CYLINDRICAL CHAMBER IN MATERIALLY INWARDLY SPACED RELATION TO SAID CIRCUMFERENTIAL RESTRICTED FUEL DELIVERY SLOT, SAID SLOT BEING SIZED TO RETRICT PREDETERMINED RELATIVELY LARGE HEAVIER FUEL BORNE PARTICLES DRIVEN OUTWARDLY IN THE VORTICAL FLOW IN SAID SWIRL CHAMBER BY CENTRIFUGAL ACTION FROM PASSING INTO SAID PRIMARY FUEL OUTLET PASSAGE, CONCENTRIC SWIRL-INDUCING GUIDE VANES BETWEEN SAID VALVE MEANS AND SAID PISTON FOR INDUCING SWIRL OF FUEL PASSING SAID VALVE MEANS, FOR PREVENTING PERIODIC BUILD UP OF RELATIVELY SMALL CONTAMINANT PARTICLES IN THE FUEL PASSING THROUGH SAID FILTER ELEMENT ON SAID VALVE MEANS TO PERMIT COMPLETE CLOSING THEREOF.