Editing Valve (section)

==Variation==
Valves vary widely in form and application. Sizes{{Ambiguous|date=July 2011}} typically range from 0.1&nbsp;mm to 60&nbsp;cm. Special valves can have a diameter exceeding 5 meters.{{Which|date=November 2009}}

Valve costs range from simple inexpensive [[Disposable product|disposable]] valves to specialized valves which cost thousands of dollars (US) per inch of the diameter of the valve.

Disposable valves may be found in common household items including [[mini-pump dispenser]]s and [[Aerosol spray dispenser|aerosol can]]s.

A common use of the term ''valve'' refers to the poppet valves found in the vast majority of modern internal combustion engines such as those in most fossil fuel powered vehicles which are used to control the intake of the fuel-air mixture and allow exhaust gas venting.