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  Indian J Med Microbiol
 

Figure 4: Line diagram showing the principle of the ascending bellows ventilator. (a) Inspiration: The reservoir bag and the adjustable pressure limiting valve are completely isolated when the ventilator is activated. The spill off valve in the ventilator circuit then acts as the relief valve for excess gases. The spill off valve in the ascending bellows system shuts during the inspiratory phase. (b) Expiration: Bellows ascend during the expiratory phase, acting as a reservoir for gases

Figure 4: Line diagram showing the principle of the ascending bellows ventilator. (a) Inspiration: The reservoir bag and the adjustable pressure limiting valve are completely isolated when the ventilator is activated. The spill off valve in the ventilator circuit then acts as the relief valve for excess gases. The spill off valve in the ascending bellows system shuts during the inspiratory phase. (b) Expiration: Bellows ascend during the expiratory phase, acting as a reservoir for gases