... valve, welded end check valve,Sanitary threaded check valve,stainless steel thread check valve, stainless steel valve, forged valve, forged check valve,Sanitary Welded Check Valve,no return valve ... (SUS304, SUS316L and EN1.4301, EN1.4404)) Seal Ring: Silicon rubber, EPDM or FPM3) Flux domination of pipeline: DN25-150 and ...