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...ve guide]]. In most applications a pressure differential helps to seal the valve and in some applications also open it. ...[Schrader valve]]s used on tires are examples of poppet valves. The Presta valve has no spring and relies on a pressure differential for opening and closing

...ly the case of automobile tires. This is a fully sealed rubber tube with a valve to control flow of air in and out. Others, including modern radial tires, u ...a [[Schrader valve]] on automobiles and most bicycle tires, or a [[Presta valve]] on high performance bicycles. Attempts have been made to make various typ