A TIW valve is a type of safety valve that is used in the oil field. This valve prevents a blow out when drilling for oil.
iT IS A VALVE USED IN OIL AND GAS DRILLING RIGS TO CLOSE IN THE DRILL STRING TO PREVENT A BLOW OUT T.I.W. is really a brand name which stands for: Texas Iron Works. The Valves on drilling rigs in the drillstring are often refered to as TIW Valve these are really Upper Kelly and Lower Kelly. More often the Safety Valve which is used on Work-over and Completions of well and/or work done through the Christmas Tree is also refered to as a TIW type valve. They all are used for pressure control.
tiw tiw tiw
Tuesday is named after Tiw's Day and Thursday is named after Thor's Day.
Tiw.
MVP is the medical abbreviation meaning mitral valve prolapse
it is the day devoted to tiu or tiw the sky god
Mitral stenosis is the medical term meaning narrowing of the mitral valve.
shut down non return valve
Tyr (Tew, Tiw) was the son of Odin.
I don't know what valve means but you should go to dictionary.com and ask.
Pn-40,means pressure nominal for a valve