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Quick-flush valve

The purpose of the quick-flush is to provide a rapid source of anesthetic-free oxygen to the patient when required. Most quick-flush valves are of the spring-loaded, push-button type, but some lever-action valves may be encountered.

Quick-flush valve


  • If the valve seat develops a leak, it will dilute the anesthetic in the breathing circuit and hinder maintenance of anesthesia.
  • The quick-flush should not be operated when a Bain circuit is in use, since the blast of high-pressure gas is directed down the endotracheal tube and may cause pulmonary barotraouma.
  • Oxygen released by the quick-flush valve should not pass through the vaporizer.

  • Some older anesthesia machines may be fitted with a nitrous oxide quick-flush. This is potentially dangerous and should be disabled.


Comments on this article should be addressed to Dr Guy Watney
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