Fuel nozzle

Claim 1

A FUEL NOZZLE OF THE CHARACTER DESCRIBED, COMPRISING: A SUPPORT HAVING A CAVITY THEREIN TERMINATING AT ONE EXTREMITY AS A FUEL OUTLET; MEANS COMMUNICATING WITH THE CAVITY FOR PROVIDING PRESSURIZED FUEL TO THE CAVITY; A DISC DEFINING SEPARATE PRIMARY AND SECONDARY FUEL METERING MEANS POSITIONED IN THE CAVITY ADJACENT SAID ONE EXTREMITY, SAID DISC HAVING AN APERTURE FORMED THEREIN COMMUNICATING WITH THE FUEL OUTLET AND PROVIDING A VALVE SEAT AND AT LEAST ONE SPIN CHAMBER; MEANS INCLUDING A FIRST PLURALITY OF SLOT MEANS FORMED ON THE OBVERSE FACE OF THE DISC ADJACENT SAID ONE EXTREMITY COMMUNICATING BETWEEN THE CAVITY AND A SPIN CHAMBER ADAPTED TO PROVIDE FIXED PRIMARY FUEL METERING MEANS; A SECOND PLURALITY OF ELONGATED AXIAL SLOTS FORMED ON THE REAR FACE OF THE DISC COMMUNICATING BETWEEN THE CAVITY AND A SPIN CHAMBER ADAPTED TO PROVIDE VARIABLE SECONDARY FUEL METERING MEANS; BELLOWS ACTUATOR MEANS IN THE CAVITY; A CYLINDRICAL PISTON VALVE OPERABLY CONNECTED TO THE BELLOWS AND ARTICULATED THEREBY FOR CONTROLLING THE FUEL FLOW THROUGH THE SECONDARY FUEL METERING MEANS, ONE EXTREMITY OF SAID PISTON VALVE BEING ADAPTED TO COOPERATE WITH THE VALVE SEAT WHEN THE FUEL PRESSURE IS BELOW A PREDETERMINED VALUE AND THE BELLOWS IS EXPANDED TO THEREBY STOP THE SECONDARY FUEL FLOW; RADIALLY EXTENDING RING MEANS ON THE EXTERIOR CYLINDRICAL SURFACE OF THE PISTON ADJACENT SAID ONE EXTREMITY THEREOF SLIDABLY ENGAGING THE DISC APERTURE FOR GUIDING THE PISTON VALVE AND SCOURING THE APERTURE WALLS DURING PISTON VALVE MOVEMENTS WHEREBY DETRIMENTAL DIRT AND SLUDGE IN THE APERTURE ARE ELIMINATED AS THE SECONDARY FUEL METERING SLOT OPENINGS INTO THE SPIN CHAMBER ARE VARIED.