Pressure regulator structure

Claim 1

IN A PRESSURE REGULATOR HAVING A PRESSURE REGULATING VALVE DISPOSED BETWEEN AN INLET AND AN OUTLET AND BEING ACTUATED BY A DEVICE RESPONSIVE TO PRESSURE VARIATIONS BETWEEN SAID VALVE AND OUTLET, IMPROVED STRUCTURE FOR CONTROLLING THE ACTION OF SAID PRESSURE RESPONSIVE DEVICE COMPRISING, A PASSAGEWAY IN SAID REGULATOR BETWEEN SAID VALVE AND OUTLET, SAID PASSAGEWAY HAVING A WALL PORTION, A TUBE IN PRESSURE-COMMUNICATING RELATION TO SAID PASSAGEWAY AND SAID DEVICE, A SAID TUBE HAVING A PORTION WHICH PROJECTS INTO SAID PASSAGEWAY, SAID TUBE PORTION HAVING A PORT, SAID PORT BEING DISPOSED CLOSELY ADJACENT SAID WALL PORTION OF SAID PASSAGEWAY, SAID TUBE HAVING ADJACENT SAID PORT EXTERIOR WALL PORTIONS WHICH ARE CURVED SMOOTHLY INWARDLY TOWARD SAID PORT, SAID WALL PORTIONS OF SAID TUBE AND PASSAGEWAY COOPERATING TO DEFINE A LOW TURBULENCE VENTURIRESTRICTION ADJACENT SAID PORT, SO THAT THE STATIC PRESSURE COMMUNICATED TO SAID DEVICE THROUGH SAID PORT RESPONSIVE TO AIR FLOW IN SAID PASSAGEWAY IS GENERALLY FREE OF TURBULENCE VARIATIONS AND IS LOWER THAN THE PRESSURE IN PORTIONS OF SAID PASSAGEWAY OUTSIDE OF THE INFLUENCE OF SAID VENTURI RESTRICTION, SAID PASSAGEWAY HAVINGAN EFFECTIVE SECTIONAL AREA GREATER THAN THE DIAMETER OF SAID TUBE PORTION, THE DIFFERENCE BETWEEN SAID EFFECTIVE AREA AND DIAMETER BEING GREATER THAN THE SPACING BETWEEN SAID PORT AND WALL PORTION, WHEREBY TO PASS MOST OF THE AIR FLOWING THROUGH SAID PASSAGEWAY SUBSTANTIALLY FREE OF THE RESTRICTIVE INFLUENCE OF SAID VENTURI RESTRICTION.