How Bicycle Valve Works. Whereas schrader valves are almost universal on car tires bicycle tubes have schrader or presta valves with most higher end bikes having presta valves. These two types of valves correspond to the matching valve on the bike tube.
Both the schrader and the presta types are good at sealing high pressures. To address the situation companies manufacture a variety of valves designed to work with tubeless setups. The presta valve also called french valve fv or sclaverand valve is a valve commonly found in high pressure road style and some mountain bicycle inner tubes it comprises an outer valve stem and an inner valve body.
Their chief differences are that schrader valves are larger and have springs that close the valve except when the pin is depressed.
Bike tubes can be purchased in either schrader or presta varieties. When the valve opens the two half moon notches split and any debris scale or buildup breaks loose and flushes away. It has a non closing seat with two half moon notches that come together to create a hole when the valve closes. Schrader valves are used in a wide variety of compressed gas and pressurized liquid applications such as small torch and.