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Difference between revisions of "Poppet valve"
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A '''poppet valve''' is a [[valve]] consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. The shaft guides the plug portion by sliding through a [[valve guide]]. In most applications a pressure differential helps to seal the valve and in some applications also open it. | A '''poppet valve''' is a [[valve]] consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. The shaft guides the plug portion by sliding through a [[valve guide]]. In most applications a pressure differential helps to seal the valve and in some applications also open it. | ||
Presta and Schrader valves used on air-filled [[tire]]s are examples of poppet valves. The Presta valve has no spring and relies on a pressure differential for opening and closing while being inflated. | |||
==Etymology== | ==Etymology== | ||