Abstract: Breathing equipment for use in toxic atmospheres or beneath water including a breathing mask, a pressure regulator adjacent the source of breathing gas, and a source of breathing gas. A conduit transports breathing gas from the source of breathing gas to the mask. The conduit includes an inner conduit that functions to transport breathing gas to the breathing mask from the pressure regulator, and an outer conduit that surrounds the inner conduit and that protects the inner conduit and defines therewith a passageway that is sealed against the surroundings. The inner conduit is connected to the breathing mask so as to deliver thereto breathing gas that leaks from the inner conduit and does not normally transport breathing gas therethrough. A pressure regulating valve connects the inner conduit to the breathing mask and delivers breathing gas to the breathing mask at an overpressure.

Abstract: A respirator mask that incorporates a respiration valve with a pressure chamber (8) between a breathing space (6) in front of the user's respiratory organs and the surrounding atmosphere. A gauge pressure in front of the user's respiratory organs during the inhalation phase as well as during the exhalation phase is established, whereupon a part of that side of the pressure chamber that faces towards the respiratory organs actuates an inhalation valve (11) in response to the movement of a regulating diaphragm (7), either directly or through a control unit (28). A detent mechanism (31), when engaged, acts counter to the regulating diaphragm (7) to detain the latter or the control unit (28) in a position in which the inhalation valve (11) is closed. When the wearer of the mask inhales, the detention provided by the detent mechanism is overcome by the force that the movement of the regulating diaphragm exerts upon the detent device during inhalation.