Intake Exhaust Valve

exhaust valve
a valve through which burned gases from a cylinder escape into the exhaust manifold
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.
(Exhaust valves) In the combustion process, these valves control the flow of the burnt air/fuel mixture to leave the engine and emerge into the atmosphere.

intake
A location or structure through which something is taken in, e.g., water into a channel or pipe from a river, fuel or air into an engine or machine, commodities into a place, etc
consumption: the process of taking food into the body through the mouth (as by eating)
An amount of food, air, or another substance taken into the body
An act of taking something into the body
an opening through which fluid is admitted to a tube or container
inhalation: the act of inhaling; the drawing in of air (or other gases) as in breathing