Pretty much what it says, fatigue and heat actually burn a hole usually on the edge of a valve causing that cylinder to lose compression.
Chat with our AI personalities
Backfiring in any motor is either badly out of time or a burnt valve.
In the absence of any other problems (such as lean running condition, worn or non-iridium spark plugs, or damp weather) expect an EGR valve stuck open or a faulty MAP sensor.
Pulmonary semilunar valve (pulmonary valve)
I believe you are referring to the "mitral" valve. It is also known as the bicuspid valve. It is the valve between the left atrium and left ventricle.
Never ever use a Gate type of valve for throttling ONLY a globe pattern is designed for this purpose and a needle valve