Damage Controlman (DC) A School Test 1 Practice

What is the purpose of a butterfly valve and where is it commonly used?

To vent air from tanks. To measure flow rate in piping. To allow gradual flow control in small piping. To provide a tight shutoff in large-diameter piping; used for isolation where full shutoff is needed.

Correct Answer:

To provide a tight shutoff in large-diameter piping; used for isolation where full shutoff is needed.

Explanation:

Butterfly valves are designed to provide a tight shutoff and isolation in large-diameter piping. The disk sits in the center of the pipe and, with a 90-degree turn of the stem, the valve goes from fully open to fully closed. This compact design yields a reliable seal for complete isolation when maintenance or safety procedures require it, while keeping a low pressure drop when fully open. They’re not primarily for venting air, measuring flow, or precise throttling in small pipes; other devices handle those tasks better. So their main use—full shutoff and isolation in large-diameter systems—explains why this option is the best fit.

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