Ball valves only demand a one/four switch to go from completely open up to totally shut. This will make them outstanding in programs needing quick shutoff as compared to alternatives like gate valves. The seat ring shall have 2 Most important leap seals having a hearth-Safe and sound graphite ring. https://tysonduhte.wikibyby.com/1442143/everything_about_butt_weld_pipe_fittings