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triple valve

noun
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Definition of triple valve

: the automatic valve under a railroad car that controls the automatic air brake by regulating by three openings the intake, exhaust, and equalization of compressed air in the brake piston

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“Triple valve.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triple%20valve. Accessed 20 Oct. 2021.

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