The Schrader valve (also called American valve) is a brand of pneumatic tyre 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 patented in the United States in 1893.
The Schrader valve consists of a valve stem into which a valve core is threaded, and is used on virtually all automobile tyres and most wider rimmed bicycle tyres. The valve core is a poppet valve assisted by a spring.
Read more about Schrader Valve: Uses, Valve, Cap, Presta Valves Vs. Schrader Valves, Dimensions