Inhalation/exhalation valve unit having light movable components

Claim 1

AN INHALATION/EXHALATION VALVE UNIT HAVING LIGHT MOVABLE COMPONENTS AND ADAPTED TO CONTROL THE INHALATION OF FRESH BREATHING FLUID INTO A BREATHING MASK OR A BREATHING MOUTHPIECE AND TO CONTROL THE EXHALATION THEREFROM OF FOUL BREATHING FLUID, COMPRISING, A CASING HAVING AN INLET, AN OUTLET, AND A BREATHING COMPARTMENT ADAPTED TO COMMUNICATE WITH A BREATHING MASK OR BREATHING MOUTHPIECE, AN INHALATION VALVE INTERPOSED BETWEEN SAID INLET AND SAID BREATHING COMPARTMENT, AN EXHALATION VALVE INCLUDING SEATING MEANS INTERPOSED BETWEEN SAID BREATHING COMPARTMENT AND SAID OUTLET, SAID EXHALATION VALVE BEING CONSTRUCTED AND ARRANGED TO NORMALLY BE IN COOPERATIVE ENGAGEMENT WITH SAID SEATING MEANS, A BALANCING DIAPHRAGM HAVING AN EXTERIOR SIDE IN COMMUNICATION WITH SAID OUTLET AND ITS INTERIOR SIDE IN COMMUNICATION WITH SAID INLET, AND FORCE-TRANSFERRING MEANS BETWEEN SAID BALANCING DIAPHRAGM AND SAID EXHALATION VALVE WHEREBY EXPANSION OF SAID BALANCING DIAPHRAGM URGES SAID EXHALATION VALVE TOWARD ITS CLOSED POSITION, SAID FORCE-TRANSFERRING MEANS BEING UNI-DIRECTIONAL, WHEREBY CONTRACTION OF SAID BALANCING DIAPHRAGM IS INDEPENDENT OF SAID EXHALATION VALVE.