Английская Википедия: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]
Mechanism
Such valves were first described by the American dentist Jay Heidbrink, who used a thin disc that was held in place by a spring.[2] The valve is adjustable and spring-loaded, allowing the opening pressure of the valve to be controlled by screwing the valve top which modifies the pressure on the spring.[1] A very light spring is used, so that at its minimum setting the valve can be opened by the patient's breathing alone using low pressures.[3] In contemporary APL valves, three orifices or "ports" are present: one for intake of gas, one for return of gas to the patient, and an exhaust port for waste gas which can be connected to a scavenging system.[1][4]
References
- ↑ 1,0 1,1 1,2 Шаблон:Cite book
- ↑ Шаблон:Cite book
- ↑ Шаблон:Cite book
- ↑ Шаблон:Cite web Wednesday, April 22, 2020
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