BS EN 1983-2006 工业用阀 - 钢制球阀 Industrial valves steel ball valve.pdf 未知 MSS SP-72 BALL VALVES WITH FLANGED OR BUTT-WELDING ENDS FOR GENERAL SERVICE.pdf 未知 JIS B2061-2009 Faucets ball taps and flush valves(Amendment 1).pdf 未知