STAS 2502-1987 Steel industrial valves SW1NG CHECK VALVES NP 16 NP 25 NP 40 NP 64 NP 100 NP 160 NP 250 NP 400 Dimensions《工业用钢质阀门 摆动止回阀NP16、NP 25、NP 40、NP 64、NP 100、NP 160、NP 250、NP.pdf

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