Why are zone valves incorporated into a hospital's central gas piping systems?
1. To terminate O2 delivery to an area in case of fire
2. To allow selective maintenance without shutting the system down
3. To allow variable pressure reduction throughout the system
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: A
Zone valves (Figure 40-12) throughout the system can be closed for system maintenance or in case of fire.
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