Lub welded npauj npaim valve yog ib qho tseem ceeb ntawm ntau yam kev siv nyob rau hauv stainless hlau pipeline system ntawm kev lag luam khoom siv dav siv.Nws yog kev siv phau ntawv lossis kev ua haujlwm tsis siv neeg ntawm kev huv-qib valve, yooj yim rau siv hauv ntau qhov chaw.