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彈簧微啟式安全閥型號:
鑄鋼:A21H-16C,A21H-25C,A21H-40C,A21H-64C,A21H-100C,A21H-160C,A21H-320C
不銹鋼:A21W-16P,A21W-25P,A21W-40P,A21Y-64P,A21Y-100P,A21Y-160P,A21Y-320P
四氟密封:A21F-16C/P,A21F/25C/P,A21F-40C/P
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