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金属密封球阀
Metal-seated ball valve
价格:¥0.00
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石油、石化及相关工业用的钢制球阀
Stell ball valves for petroleum,petrochemical and allied industries
价格:¥0.00
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铁制和铜制球阀
Cast iron and copper alloy ball valves
价格:¥0.00
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对夹式止回阀
Wafer type check valve
价格:¥0.00
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球阀 静压寿命试验规程
Ball valve-potential pressure life test regulation
价格:¥0.00
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