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
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up triple valve? Please tell us where you read or heard it (including the quote, if possible).