Which of the following is an example of a butterfly valve symbol?

![15560|106x160](upload://ymTAXz59bH5T7DAQAKGagE3Iddf.jpeg)


A. Incorrect. This is the symbol for a check valve.
B. Incorrect. This is the symbol for a gate valve.
C. Incorrect. This is the symbol for a hand valve.
D. Correct. This is the symbol for a butterfly valve.

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