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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