Patent ID: 6994086

Claim:
A demand regulator comprising: a tube for connection with the inside of a breathing mask; an admission of pressurized breathing gas communicating with said tube; a main valve disposed between the admission and the tube, said main valve defining a control chamber separated from admission by a diaphragm subjected to pressure, said control chamber being connected to the admission via a constriction; an ejector interposed between the main valve and the tube; a passage adapted for allowing dilution air to arrive downstream from the ejector; a pilot valve defining a chamber separated from said tube by a diaphragm responsive to breath-in suction, said chamber being in communication with the admission; a shutter carried by said pilot valve diaphragm, suitable for putting into communication said control chamber with said pilot valve chamber or for separating said chambers; a passage for putting said pilot valve chamber into communication with the atmosphere; a valve discharging to atmosphere for limiting pressure in the pilot valve chamber; a selector member carrying a first valve and a second valve, said selector member being displaceable between an emergency position wherein said first valve closes said dilution air passage and said second valve closes said passage for putting said pilot valve chamber into communication with the atmosphere, thereby feeding said tube with pure breathing gas at an over pressure, and a normal position wherein said first valve opens said dilution air passage and said second valve opens said passage for putting said pilot valve chamber into communication with the atmosphere, thereby feeding said tube with diluted gas without over pressure; and a member which cooperates with a storage box, when the demand regulator with the mask is in a mask storage box, to cause said pilot valve chamber to be in communication with the atmosphere.