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摘要

A valving mechanism for a lung controlled pressure respirator system which uses a mask which fits to the head of a person and includes an outer mask portion adapted to be sealed around the periphery of the person's face and an inner mask portion arranged within the outer mask portion, comprises a housing wtih a flexible diaphragm which extends across the interior of the housing. On one side of the diaphragm the housing is exposed to atmospheric pressure and on the opposite side it is connected to a pressure space defined between inner and outer mask portions of the oxygen mask. The housing also has a control valve portion in communication with the opposite side of the diaphragm. A respirator breathing air supply conduit is connected to the control valve portion. The closing piston valve is movable in the control valve portion and has a port which is alignable with the breathing air supply conduit to permit flow from the breathing air supply conduit to the control valve portion and through the communication of the control valve to the pressure space between the inner and outer mask of the oxygen breathing mask. The construction includes a control tipping lever which is pivotally mounted between the control diaphragm and the closing piston valve and has an arm portion which is engageable with the diaphragm and is displaceable by movement of the diaphragm to displace the closing piston between positions in which the port varies its position in respect to disalignment witwh the supply conduit so as to vary the amount which is supplied into the pressure space between the inner and outer mask of the breathing mask.