Valves play a critical duty in a plethora of commercial applications, specifically in the oil and gas field. Amongst one of the most significant sorts of valves utilized are the fully welded ball valve, the trunnion mounted ball valve, the metal seated ball valve, and different forms of butterfly valves http://tawassol.univ-tebessa.dz/index.php?qa=user&qa_1=dimehedge24