Poppet valve | Wikipedia audio article
Channel: wikipedia tts
Date: 02/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Poppet_valve


00:01:00 1 Etymology
00:02:04 2 Operation
00:03:51 2.1 Internal combustion engine
00:08:21 2.1.1 Valve position
00:10:39 2.1.2 Valve wear
00:12:25 2.2 Steam engine



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SUMMARY
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A poppet valve (also called mushroom valve) is a valve typically used to control the timing and quantity of gas or vapour flow into an engine.
It consists 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 portion of the hole where the plug meets with it is 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 valve was most likely invented in 1833 by E.A.G. Young of the Newcastle and Frenchtown Railroad. Young patented his idea, but the Patent Office fire of 1836 destroyed all records of it.