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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