1 YBF YBF 04-2009 石油、石化、天然气及相关工业用 钢制球阀 Steel ball valves for petroleum, petrochemical, natural gas and allied industries (ISO 17292:2004 Metal ball valves f...

1 YBF YBF 03-2009 石油、石化、天然气及相关工业用 钢制旋启式止回阀 Steel swing check valves for petroleum, petrochemical, natural gas and allied industries (BS 1868:1975(R1990) Spec...

1 YBF YBF 02-2009 石油、石化、天然气及相关工业用 钢制截止阀和升降式止回阀 Steel globe valves and lift check valves for petroleum, petrochemical, natural gas and allied industries (BS 1...