1. The demand valve was a revolutionary new piece of equipment. 2. The Universal used the same demand valve and was modular in design. 3. In both systems, each diver carries two demand valves . 4. Examples include an auxiliary demand valve , a pony bottle and bailout bottle. 5. Demand valve resuscitators were introduced with restrictors to limit flow rates to 40 lpm.6. The ADV is virtually identical in construction and function to the open circuit demand valve . 7. They consist of a first-stage regulator, and a second-stage demand valve . 8. The associated demand valve comprising the bail-out valve is always a single hose regulator. 9. Breathing gas is supplied through a mouth-held demand valve or light full-face mask. 10. The secondary demand valve can be a hybrid of a demand valve and a buoyancy compensator inflation valve.
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