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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.
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.
The valve stem D moves up to open the valve discs C. James Watt was using poppet valves to control the flow of steam into the cylinders of his beam engines in the 1770s. A sectional illustration of Watt's beam engine of 1774 using the device is found in Thurston 1878:98, [ 13 ] and Lardner (1840) provides an illustrated description of Watt's ...
Besides puncturing of the tire a flat can be caused by: failure of or damage to the valve stem; a nail in the tire; rubbing of the tire against the road; ripping of the tire; separation of tire and rim by collision with another object; excessive wear of the tire tread allowing explosive tire failure or road debris tearing through the tire. Some ...
It is recommended the valve stem is to be at least 10 mm longer than the rim is deep to allow adequate room for the bicycle pump to be attached. It has a narrower diameter of 6 mm (0.24 in), compared to Dunlop and Schrader valves, measuring 8 mm (0.31 in). The weakest point of a bicycle rim is usually the hole for the valve stem.