石油、化工及相关工业用的钢制旋启式止回阀 放泄孔接管和放泄孔凸台的尺寸
止回阀的公称尺寸 DN
放泄孔接管公称尺寸 DN
凸台的最小直径/mm
50~100
15
38
125~200
20
44
250~300
25
54
≥350
40
70
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