| 摘要 |
Presented is a sub-tidal volume rebreather (STVR) and various embodiments th at extend the useful range and/or reduce the encumbrance of any breathable gas, whether filtered, compressed, or otherwise, used by a diver, serviceman, fireman, or other user of such equipment. In an exemplary embodiment the second stage regulator (Reg2) of the rebreather (STVR) is connected via an ambient pressure breathing tube (APTR) to an overpressure relief valve (ORV) , which is again connected to a sub- tidal volume counter lung (STVcI) via a C 02 absorbent canister (Scrub). During each exhalation, upon maximum inflation o f the sub-tidal volume counter lung (STVcI), the overpressure relief valve (OR V) releases the heavily C02 laden back portion of the user' s respiratory tidal volume (RTV) before it reaches the C02 absorbent chemical in its canister (Scrub).
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