| 11. | The secondary demand valve can be a hybrid of a demand valve and a buoyancy compensator inflation valve.
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| 12. | It was not until December 1942 that the demand valve was developed to the form which gained widespread acceptance.
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| 13. | This route can not be closed and supplies the helmet demand valve and free flow valve under normal circumstances.
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| 14. | The demand valve could also provide oxygen at any flow rate required to a conscious patient in respiratory distress.
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| 15. | By providing a secondary demand valve the need to alternately breathe off the same mouthpiece when sharing air is eliminated.
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| 16. | Use of the demand valve resuscitator in Europe was limited by the lack of pressure relief valve or audible alarm for high pressure.
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| 17. | It does not have a demand valve or electronic parts, and in theory this would be fewer parts to suffer from failures.
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| 18. | The vast majority of demand valves are open circuit, which means that the exhaled gas is discharged into the surrounding environment and lost.
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| 19. | The bailout valve ( BOV ) is an open circuit demand valve built into a rebreather mouthpiece or other part of the breathing loop.
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| 20. | The Commeinhes demand valve was an adaptation of the Rouquayoul-Denayrouze mechanism, not as compact as was the Cousteau-Gagnan apparatus.
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