Patent ID: 6729331
Filing Date: 2004-05-04
Classification: A62B,B63C,G05D

Abstract:
A pressure regulator suitable for use as a breathing demand valve in various self-contained breathing apparatus, comprising a first chamber having an inlet port and an outlet flow path, the inlet port being connectable to the outlet of a pressurized fluid supply, an inlet valve being positioned within the inlet port and biased so as to seal the first chamber from the pressurized fluid supply, wherein the opening of the inlet valve can be actuated by the thrust due to the deflection of a diaphragm positioned so as to separate the first chamber from a second chamber, a baffle plate positioned in between the diaphragm and inlet port reducing negative feedback to the flow rate through the first chamber by preventing a portion of the pressurized fluid flow released through the open inlet valve from impinging upon, and tending to deflect, the diaphragm in a direction tending to close the inlet valve, and wherein a Venturi tube extends from an outlet flow path such that, upon removal of fluid from the first chamber, along the outlet flow path, the pressure in the gap between the baffle plate and diaphragm is reduced by the Venturi tube accordingly.