Breathing apparatus with gas container with variable volume for gas feed

摘要

The changeover valve is formed by a valve piston (11) axially movable in a bore, which has an end surface freely located to the gas container (2) and an end surface freely located to the valve chamber (14). The valve piston is extended by an end pin, which engages in a cutoff manner in a bore leading to the outlet (17). At least one of the end positions of the valve piston is provided with a securing device (5,6,9) which holds it, the holding force of which is such that when a predetermined pressure in the gas container is reached the valve opens to the lung connection.