handwheel

[hand-hweel, -weel]
noun
a wheel, as a valve wheel, turned by hand.

Origin:
1930–35; hand + wheel

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
handwheel

noun
1. a wheel worked by hand 
2. control consisting of a wheel whose rim serves as the handle by which a part is operated 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
The briefing specifically addressed handling cylinders in a manner to prevent contact with the valve handwheel.
The handwheel will disengage and the valve will remain in the current position.
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