What type of valves are used in service as single-direction flow control?
A) Check valves
B) Actuated valves
C) Pressure relief valves
D) Manually operated valves
Answer: A
Explanation: A) Correct. Check valves are used in service as single-direction flow control.
B) Incorrect. Check valves are used in service as single-direction flow control.
C) Incorrect. Pressure relief valves are safety mechanisms that automatically operate, or open, to release pressure when it exceeds operating values.
D) Incorrect. Manually operated values have a handle or a hand wheel that is turned to open or close the valve.
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