There is disclosed a first stage pressure reducer (20) for a breathing apparatus comprising: a body (210) defining a cavity (211), the cavity (211) having a higher-pressure region (212) configured to receive higher-pressure gas from a gas source, a lower-pressure region (214) configured to receive lower-pressure gas from the higher-pressure region (212), and a piston bore (260), the piston bore (260) connecting the higher-pressure region (212) and the lower-pressure region (214); a piston (220) configured to move reciprocally through the piston bore (260), and further configured to transfer gas from the higher-pressure region (212) to the lower-pressure region (214); a bushing (240) disposed coaxially with the piston bore (260) and around at least a portion of the piston (220), the bushing (240) arranged to engage the piston (220) and inhibit contact between the piston (220) and the piston bore (260); and a sealing element (230) arranged between the higher-pressure region (212) and the bushing (240), the sealing element (230) configured to isolate the bushing (240) from the higher-pressure region (212). Also disclosed is a self-contained breathing apparatus comprising a first stage pressure reducer (20).


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    Title :

    FIRST STAGE PRESSURE REDUCER


    Additional title:

    DRUCKREGLER DER ERSTEN STUFE
    RÉDUCTEUR DE PRESSION DE PREMIER ÉTAGE


    Contributors:

    Publication date :

    2025-05-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    A62B DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING , Vorrichtungen, Geräte oder Verfahren zur Lebensrettung / B63C LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS , Zuwasserlassen, Trockenstellen, Docken oder Bergen von Schiffen



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