Abstract: A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

Abstract: A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

Abstract: A speed reducer arrangement (200) for a line retraction device (100), including at least one lug (4) fixed on a surface of a rotatable hub (2) and configured to rotate along with the hub (2); at least one brake shoe (5) having at least one groove (8) extending therethrough and configured to at least partially receive the at least one lug (4), such that, as the hub (2) rotates, the at least one brake shoe (5) is configured to slidably move along the at least one groove (8) from an inactivated position, wherein the at least one brake shoe (5) is located nearest the center of the hub (2) to an activated position, wherein the at least one brake shoe (5) contacts at least one contact surface of the line retraction device (100) to thereby slow the rotation of the hub (2); and at least one biasing member (6) configured to urge the at at least one brake shoe (5) towards the inactivated position.