止回阀系列
青铜丝口止回阀451A| DN | INCH | d | L | H |
| 15 | ½" | 12 | 58 | 37 |
| 20 | ¾" | 18 | 66 | 43 |
| 25 | 1" | 24 | 76 | 49 |
| 32 | 1¼" | 30.6 | 88 | 57.5 |
| 40 | 1½" | 37 | 96 | 63 |
| 50 | 2" | 48.6 | 112 | 72 |
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