J561Y J461Y伞齿轮焊接截止阀 正齿轮焊接截止阀

J961Y-P54 100V J961Y-P54100V电动铬钼钒钢截止阀

J961Y-200 J961Y-250 J961Y-320电动焊接截止阀

J61Y-P54 170V J61Y-P54170V焊接式电站截止阀

J61Y-P54 140V J61Y-P54140V高温高压截止阀

J61Y-P54 100V J61Y-P54100V铬钼钒钢截止阀

J61Y-200 J61Y-250 J61Y-320 电站焊接截止阀