氨用截止阀和升降式止回阀26478-2011-gbt-e-300.pdf

ICS23.060.50J16中华人民共和国国家标准GB/T26478—2011氨用截止阀和升降式止回阀Globevalvesforammoniaandliftcheckvalves2011-05-12发布2...