Lung Demand Regulator

Abstract

A lung demand regulator for a breathing apparatus may include an ambient valve having: a bypass configuration in which the ambient valve is configured to permit a flow of gas between a first side of the ambient valve and a second side of the ambient valve; a non-return configuration in which the ambient valve is configured to permit a flow of gas from the first side of the ambient valve to the second side of the ambient valve, and prevent a flow of gas from the second side to the first side; and a lockout mechanism having a lockout configuration in which the ambient valve is held in the bypass configuration, and an unlocked configuration in which the ambient valve is biased into the non-return configuration. Also disclosed is a breathing apparatus comprising a lung demand regulator.

Dependencies are inferred from the claim text.