I don't know what valve means but you should go to dictionary.com and ask.
MVP is the medical abbreviation meaning mitral valve prolapse
Mitral stenosis is the medical term meaning narrowing of the mitral valve.
shut down non return valve
Pn-40,means pressure nominal for a valve
Carbon Steel
Your meaning is unclear. Your system will already have pressure switch, -why would you need a pressure valve?- or are you unaware of the difference between a valve and a switch.
Valvuloplasty
valvul/o
It is the door/opening between the ventricles and atriums.
When a valve cannot close all the way it is called incompetent.
You lucked out. EGR valve circ insufficient-meaning bad valve or no vac to valve, etc. A cheap repair and not a critical item. It's for emissions.
Vegetation