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A regulator assembly is provided for use in a respirator system to supply a regulated flow of air to a respirator head piece. The respirator assembly comprises a housing (15) having an air inlet port (17) for connection to a source of air at comparatively high pressure, and an air outlet port (23) f

A regulator assembly is provided for use in a respirator system to supply a regulated flow of air to a respirator head piece. The respirator assembly comprises a housing (15) having an air inlet port (17) for connection to a source of air at comparatively high pressure, and an air outlet port (23) for connection to the respirator head piece. The housing (15) contains an air pressure-reduction stage (19) in communication with the inlet port (17), and a noise-reduction stage (21) between the pressure-reduction stage and the outlet port (23). The noise reduction stage (21) comprises two, spaced, muffler discs (41, 43) the first of which is positioned adjacent the air outlet (39) of the pressure-reduction stage (19). A deflector plate (47) deflects the airflow from the pressure-reduction stage (19) through the first muffler disc (41), and thereby diffuses the air flow before it reaches the second muffler disc (43).

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1. A regulator assembly for use in a respirator system to supply a regulated flow of air to a respirator head piece; the assembly comprising: a housing that comprises (a) an air inlet port for connection to a source of air at comparatively high pressure, and (b) an air outlet port for connection

1. A regulator assembly for use in a respirator system to supply a regulated flow of air to a respirator head piece; the assembly comprising: a housing that comprises (a) an air inlet port for connection to a source of air at comparatively high pressure, and (b) an air outlet port for connection to the respirator head piece; the housing having an air flow path between the air inlet port and the air outlet port, the housing containing (1) an air pressure-reduction stage in communication with the inlet port, and (ii) a noise-reduction stage located in the air flow path within the housing between the pressure-reduction stage and the outlet port; wherein the noise-reduction stage comprises first and second noise-reduction members spaced apart from each other along the air flow path, the first noise-reduction member being positioned adjacent the air outlet of the pressure-reduction stage, and including a deflector member arranged to deflect the air flow from the pressure-reduction stage through the first noise-reduction member and thereby diffuse the air flow before it reaches the second noise-reduction member. 2. The regulator assembly of claim 1, wherein each noise reduction member comprises a mass of noise-reduction material positioned in the air flow path. 3. The regulator assembly of claim 1, wherein each noise-reduction member comprises a disc of sintered material. 4. The regulator assembly of claim 1, wherein the deflector member is positioned to divert air from a direct flow through the first noise-reduction member from the regulator device. 5. The regulator assembly of claim 1, wherein the pressure-reduction stage comprises a pressure-regulator, having an adjustable air flow. 6. The regulator assembly as claimed in claim 5, wherein which the pressure-regulator has a plurality of settings each of which is associated with a respective output air flow from the regulator, the adjustable air flow for each setting being substantially constant and independent of the pressure at which air is supplied from the said source over at least a pre-selected range of pressures. 7. The regulator assembly of claim 1, further including an odor filter located in the air flow path within the housing. 8. The regulator assembly of claim 1, further including a warning device exposed to the pressure at the air inlet port and operable to emit warning signal when the pressure at the air inlet port falls below a predetermined value. 9. A respirator system that comprises a regulator assembly of claim 1, wherein the air outlet port of the assembly is connected to a respirator head piece.