nonrebreathing valve

non·re·breath·ing valve

a type of valve that prevents mixture of inhaled and exhaled gases.

non·re·breath·ing valve

(nonrē-brēdhing valv)
Type of valve that prevents mixture of inhaled and exhaled gases.
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References in periodicals archive ?
While wearing a nose clip, patients breathed tidally through a mouthpiece connected to a two-way nonrebreathing valve.
There is a nonrebreathing valve available to prevent this.