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).
FIRST STAGE PRESSURE REDUCER
DRUCKREGLER DER ERSTEN STUFE
RÉDUCTEUR DE PRESSION DE PREMIER ÉTAGE
2025-05-28
Patent
Electronic Resource
English