Schrader valve

The original Schrader valve design was invented in 1891 and patented in the United States in 1893.

In 1844, he opened the Schrader company, a shop dealing in rubber products in Manhattan, New York City.

[3] In 1845, he began supplying fittings and valves for rubber products made by the Goodyear brothers, including air pillows and life preservers.

In addition to tube and tubeless tires, Schrader valves of varying diameters are used on many refrigeration and air conditioning systems to allow servicing, including recharging with refrigerant; by plumbers conducting leak-down pressure tests on pipe installations; as a bleeding and test port on the fuel rail of some fuel injected engines; on bicycle air shock absorbers to allow adjustment of air pressure according to the rider's weight; for medical gas outlets within hospitals and some medical vehicles; and in the buoyancy compensator (BC) inflators of SCUBA systems where the ability to easily disconnect an air hose (even underwater) without the loss of tank air is critical.

A Schrader valve consists of an externally threaded hollow cylindrical metal tube, typically nickel-plated brass.

[6] With the advent of miniature electronics, Schrader valve stems with integrated transmitters for tire pressure monitoring systems (TPMS) became available.

Some metal caps are equipped with prongs to enable removing and replacing valve cores, thereby serving two functions: seal and emergency tool.

Schrader valves are used in a wide variety of compressed gas and pressurized liquid applications such as small torch and grill cylinders, and air shocks.

Another disadvantage of the Schrader is that debris may be introduced into its spring-loaded pin, impairing inflation, whereas the Presta valve relies only on air pressure and a small knurled nut to keep it shut.

Inflating a bicycle tire equipped with a Presta or Dunlop valve at an automobile filling station requires an adaptor, while a Schrader-valved tube does not.