GASMISCHGERAET FUER DRUCKGASE, INSBESONDERE FUER ATMUNGS- UND MEDIZINISCHE GERAETE

摘要

A gas mixing apparatus for gases under pressure particularly for respirators and medical devices which has a plurality of compressed gas supply lines which are connected to a mixing device for delivery into a mixed gas delivery line includes at least one by pass connected from at least one compressed gas supply line to the delivery line. The by pass line includes an automatically pressure operated shut off valve which is responsive to a drop off in pressure to feed gas through the by pass line to the delivery line. The shut off valve includes a settable spring biased diaphragm which carries a movable valve member which is urged against the valve seat at pressure conditions which are set for the normal operation of the device. The by pass line is open to deliver gas from the compressed air lines to the delivery line whenever the delivery line pressure drops off. A warning signal may also be arranged in the connection and in some instances a compressed gas connection to the by pass line provides means for feeding gas from a separate compressed gas supply in the event delivery pressure drops off.