What type of valve is a flow-regulating device that uses a flow-control element shaped like a hollowed out ball, attached to an external handle, to increase or decrease flow?
A) Ball valve
B) Plug valve
C) Butterfly valve
D) Check valve
Answer: A
Explanation: A) Correct. A ball valve is a flow-regulating device that uses a flow-control element shaped like a hollowed out ball, attached to an external handle, to increase or decrease flow.
B) Incorrect. A plug valve is a flow-regulating device that uses a flow-control element shaped like a hollowed-out plug, attached to an external handle, to increase or decrease flow.
C) Incorrect. A butterfly valve is a flow-regulating device that uses a disc-shaped flow-control element to increase or decrease flow.
D) Incorrect. A check valve allows flow only in one direction.
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