What is a manual valve?

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Multiple Choice

What is a manual valve?

Explanation:
Manual valves are operated by hand; you open or close them by turning a hand wheel or moving a lever, giving immediate, local control of flow without any electrical or pneumatic actuation. This hands-on operation is what defines a manual valve. The other descriptions refer to automatic or pneumatic actuation, or to a valve that cannot be shut off, which is not how a manual valve works. Therefore, a valve opened or closed using a hand wheel or lever is the correct definition.

Manual valves are operated by hand; you open or close them by turning a hand wheel or moving a lever, giving immediate, local control of flow without any electrical or pneumatic actuation. This hands-on operation is what defines a manual valve. The other descriptions refer to automatic or pneumatic actuation, or to a valve that cannot be shut off, which is not how a manual valve works. Therefore, a valve opened or closed using a hand wheel or lever is the correct definition.

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