Middleeast Valve is the biggest Air release valve supplier in Dammam , which supplies good quality of valves to Abqaiq, Dhahran, Hofuf, and Jubail. An air release valve, also known as an air vent or air valve, is a mechanical device used in plumbing and fluid systems to release excess air or gas from a system. Available materials: CF8M, CF8, SS316, CF8M, WCB, WC6, WCC, LCB, LCC, SS304, SS316. Class:150-300. Pressure: PN6 to PN40. Size:1/2”-8”. End: flanged, threaded.