Two Applications of a Differential Pressure Valve in Anaesthesia
It is common practice in electronic design to arrange for a system to compare the values of selected signals and to react should the relationship between these values change. The simplest pneumatic analogy in an anaesthetic breathing circuit is the Heidbrink valve, which dumps anaesthetic gas when the circuit pressure rises above the ambient level. This is a description of two valves in which two values are compared to a third constant value, thus rendering accurate calibration unnecessary and allowing the performance to adapt to changing dynamics.
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