Pressure regulators are used on anaesthetic machines for three purposes:
• to reduce the high pressure of gas in a cylinder to a safe working level
• to prevent damage to equipment on the anaesthetic machine, e.g. flow control valves
• as the contents of the cylinder are used, the pressure within the cylinder decreases and the regulating mechanism maintains a constant outlet pressure, obviating the necessity to make continuous adjustments to the flowmeter controls.
The principles underlying the operation of flowmeters are described in detail in Chapter 30.
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