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valve pilot

noun
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Definition of valve pilot

: a device used on a steam locomotive to inform the engineman by visual indication on a dial the proper percentage of cutoff to use in admitting steam to the cylinders

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“Valve pilot.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/valve%20pilot. Accessed 8 December 2019.

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