Adjustable pressure-limiting valve

An adjustable pressure-limiting valve (commonly abbreviated to APL valve, and also referred to as an expiratory valve, relief valve or spill valve) is a type of flow control valve used in anaesthesiology as part of a breathing system. It allows excess fresh gas flow and exhaled gases to leave the system while preventing ambient air from entering.[1]

  1. ^ Baha Al-Shaikh; Simon Stacey (2013). "Breathing systems". Essentials of Anaesthetic Equipment. Elsevier Health Sciences. pp. 55–73. ISBN 978-0-7020-4954-5.
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