Dual breathable gas supply apparatus

Abstract

Disclosed is a breathable gas supply apparatus, for connecting with a diving face mask or helmet. The gas supply apparatus is connectable with an inlet and outlet of a rebreather or reclaim unit for a first supply of breathable gas for closed-circuit use, and connectable with a second supply of breathable gas for open-circuit use. The breathable gas supply apparatus comprises: a first valve for sealing or opening supply from the rebreather or reclaim unit; and for opening or sealing supply from the second supply of breathable gas; and a third valve capable of exhausting exhaled gas during open-circuit use and retaining exhaled gas during closed-circuit use. The breathable gas supply apparatus is configured such that sealing the first valve corresponds to enabling supply of compressed gas and exhaust corresponds to enabling switching between two sources of breathable gas without interruption.

Dependencies are inferred from the claim text.