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Dunlop valve

Bicycle tube valve

The Dunlop valve, (abbreviated as DV; also called a Woods valve, an English valve or a Blitz valve{{cite web

The Dunlop valve originally used a tight rubber sleeve (see illustration of "original plug") which had to be forced open by air pressure while pumping (not only were these difficult to inflate, but the rubber would perish over time, allowing leakage and eventually, complete failure), but modern Dunlop valves use a different plug (core) using either an internal ball bearing or a spring-loaded rubber plug that is unseated by pumping, making the valve as easy to pump as a Presta valve.

The inventor was C. H. Woods. It superseded Dunlop's original valve for pneumatic tyres.

Dunlop valves are uncommon on bicycles in the US, where either Presta or Schrader valves are used.

Dimensions

The external thread of a Dunlop valve is 0.305-32 TPI (approx. 7.75×0.794 mm in metric designation).

References

"Japan Cycling Navigator:Information: Bikes in Japan: Tyres and Tubes". www.japancycling.org.
(8 October 2018). "Inner tube buying guide".
Sheldon Brown. "Glossary: Woods Valve".
Moulton, Dave. (21 August 2007). "John Boyd Dunlop". Dave Moulton's Blog.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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