Schrader valve

Schrader valve components (from left to right) the valve core closed (top) and open (bottom), the order of assembly, end view of stem without core and with core (top) and stem with the dust cap on (bottom). The core has a short outer thread which is screwed into the inner thread of the stem. The visible outer thread of the stem holds the dust cap.

The Schrader valve (also called American valve[1]) is a type of pneumatic tire valve used on virtually every motor vehicle in the world today. The Schrader company, for which it was named, was founded in 1844 by August Schrader. The original Schrader valve design was invented in 1891, and patented in the United States in 1893.[2]

The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads. Using the appropriate tools, a faulty valve core can be immediately extracted from the valve stem and replaced with a new one.

  1. ^ Tony Atkins and Marcel Escudier (25 April 2013). A Dictionary of Mechanical Engineering. Oxford University Press. p. 312. ISBN 9780199587438. Retrieved 23 October 2013.
  2. ^ George H.F. Schrader, "Valve," U.S. patent 0,495,064 (filed: January 9, 1893; issued: April 11, 1893).