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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 ...
By 1891 he had produced the Schrader valve, which was his most popular invention and is still used today on many bicycle tires and almost all automobile, truck, and motorcycle tires. August's son, George, is generally credited with the experimental work that resulted in the valve's creation. In 1893, Schrader patented the tire valve cap.
Valve stem or simply valve: port for adding or releasing air from the inner tube. Two types are commonly used: Presta and Schrader. A third type, the Woods/Dunlop valve, can still be found in Europe and Asia. Wheel: as in common usage. Traditionally and most commonly spoked; Wingnut: for attaching wheels before the development of the quick ...
The Dunlop valve has a wider base than a Presta valve, similar enough in size to a Schrader valve to use identically drilled valve holes in rims, [3] but it can be inflated with a Presta valve adapter. [4] The inner mechanism of the valve can be replaced easily, without the need for special tools.
A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), [1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [2] [3] or both, to prevent the gas from escaping.
A Presta valve has a nut holding the valve closed, but this is not an advantage in practice, as ordinary bicycles never go fast enough to open a Schrader valve. Further, at least some motor-paced speed record bicycles have used Schrader valves. (The actual speed of Schrader opening depends on many factors; 150 kph is only a very rough guide.