What is a Poppet Valve?

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Poppet Valve:

A poppet (also called mushroom valve) is a valve typically accustomed control the timing and quantity of gas or vapor flow into an engine.

It consists of a hole, usually round or oval, and a tapered plug, usually a circularity on the top of a shaft also called a valve stem. The portion of the opening where the plug meets with it’s called the “seat” or “valve seat”.

The shaft guides the plug portion by sliding through a valve guide. In exhaust applications, a pressure differential helps to seal the valve and in intake valves, a pressure differential helps open it. The poppet was possibly invented in 1833 by E.A.G. Young of the Newcastle and Frenchtown Railroad. Young patented his idea, but the bureau fire of 1836 destroyed all records of it.



The word poppet shares etymology with “puppet”: it’s from the center English popet (“youth” or “doll”), from Middle French poupette, which may be a diminutive of poupée. The utilization of the word poppet to explain a valve comes from the identical word applied to marionettes, which, just like the poppet, move bodily in response to remote motion transmitted linearly. In the past, “puppet valve” was a synonym for the poppet valve; however, this usage of “puppet” is now obsolete.

The valve stem moves up and down inside the passage called a guide, which is fitted within the cylinder block. The top of the valve called valve face is mostly ground to a 45-degree angle, so on fit properly on the valve seat within the block and forestall leakage.

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