Abstract: A re-configurable pressure regulator for breathing apparatus having a valve housing with a connector at a first and a second end. A pressurized source of breathable gas is connected to either end and a removable blanking plug is connected to the other end of the housing. A double acting valve within the housing selectively opens a first or second opening in the housing, depending on which end the source of breathable gas is connected, which opening forms the inlet and outlet from the housing.

Abstract: The invention provides, in one aspect, a head up display unit for a re-circulating gas self-contained breathing apparatus of the type having at least one sensor for determining the oxygen partial pressure of the re-circulating gas. At least one optical fiber (32) is provided for transmitting a light signal or signals from a respective light emitter, positioned outside the wearer's field of view and electrically connected to the at least one sensor, to a display (26) in the wearer's field of view to provide the wearer with a visual indication of the light emitter signal or signals.

Abstract: The present invention concerns a re-configurable pressure regulator (10) for breathing apparatus. The regulator comprises a valve housing (14) having connection means (36,52) at first and second ends thereof for connection, in use, at one of the ends to a pressurised source (90,92) of breathable gas and at the other end to a removable blanking plug (42), wherein in a first configuration of the regulator the first end is closed by a removable blanking plug and in a second configuration the second end is closed by the blanking plug, with the other end being open and connectable to said breathable source of gases. The regulator further comprising a diaphragm case (12) and a diaphragm (18) located therein dividing the interior of the case to provide a first chamber (16) having an inlet/outlet for communicating breathable gases to and from a user. The first chamber accommodates at least part of the valve housing.