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氧气过滤器是专为制氧管网设计的一种特殊过滤器，过滤器由分流锥、过滤网管组成，水流推力主要起到气体分流，因而避免过滤网受正面引起的破裂。
主要尺寸 QF型DN40-400，PN1.6～4.0
| 公称通径DN | D1 | D2 | 结构长度 L | | 1.6 | 1.6 ～ 4.0 | | 40 | 45 | 76 | 350 | 400 | | 50 | 57 | 89 | 380 | 420 | | 65 | 76 | 108 | 450 | 500 | | 80 | 89 | 133 | 550 | 600 | | 100 | 108 | 159 | 700 | 750 | | 125 | 133 | 219 | 850 | 900 | | 150 | 159 | 219 | 1000 | 1050 | | 200 | 219 | 273 | 1150 | 1250 | | 250 | 273 | 325 | 1250 | 1400 | | 300 | 325 | 426 | 1400 | 1600 | | 350 | 377 | 478 | 1500 | 1700 | | 400 | 426 | 529 | 1600 | 1800 |
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