In a pulse-demand oxygen-delivery system, the _____ replaces the flowmeter
a. Pendant c. Pressure-relief valve
b. Demand valve d. Flow valve
ANS: B
The demand valve connects directly to the oxygen source (50 psig), therefore replacing the flowmeter that is used with continuous-flow cannulas. Note that demand systems can function as pulsed or continuous-flow sources of oxygen. Settings allow the operator to select the equivalent of 1 to 5 L/min of oxygen flow from a conventional flowmeter.
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