APL Valve Function — FRCA Final MCQ

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EasyAnaesthetic Equipment & SafetyAPL Valve FunctionFRCA Final

The APL valve in a breathing system prevents:

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Correct answer: B — Tidal volume measurement

The APL valve opens when circuit pressure exceeds its set threshold, venting excess gas. During spontaneous ventilation set fully open; during manual ventilation partially closed.

Reference: RCOA – 2023 – Equipment: breathing systems