|                                       连接尺寸                         |  | 止回阀是能自动阻止流体倒流的阀门。止回阀的阀瓣在流体压力作用下开启,流体从进口侧流向出口侧。当进口侧压力低于出口侧时,阀瓣在流体压差、本身重力等因素作用下自动关闭以防止流体倒流。 |                                                                 | 压力尺寸 | 通径DN(mm) |                           | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 500 |                           | 16C | L | 130 | 150 | 160 | 180 | 200 | 230 | 290 | 310 | 350 | 400 | 480 | 600 |  |  |  |  |  |                           | D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 360 |  |  |  |  |  |                           | D1 | 65 | 75 | 85 | 100 | 110 | 125 | 145 | 160 | 190 | 220 | 250 | 310 |  |  |  |  |  |                           | D2 | 45 | 55 | 65 | 78 | 85 | 100 | 120 | 135 | 160 | 188 | 218 | 278 |  |  |  |  |  |                           | Z-Φd | 4-Φ14 | 4-Φ14 | 4-Φ14 | 4-Φ18 | 4-Φ18 | 4-Φ18 | 8-Φ18 | 8-Φ18 | 8-Φ23 | 8-Φ25 | 8-Φ25 | 12-Φ30 |  |  |  |  |  |                           | 25C | L | 130 | 150 | 160 | 180 | 200 | 230 | 290 | 310 | 350 | 400 | 480 | 600 |  |  |  |  |  |                           | D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 360 |  |  |  |  |  |                           | D1 | 65 | 75 | 85 | 100 | 110 | 125 | 145 | 160 | 190 | 220 | 250 | 310 |  |  |  |  |  |                           | D2 | 45 | 55 | 65 | 78 | 85 | 100 | 120 | 135 | 160 | 188 | 218 | 278 |  |  |  |  |  |                           | Z-Φd | 4-14 | 4-14 | 4-14 | 4-18 | 4-18 | 4-18 | 8-18 | 8-18 | 8-23 | 8-25 | 8-25 | 12-25 |  |  |  |  |  |                           | 40C | L | 130 | 150 | 160 | 180 | 200 | 230 | 290 | 310 | 350 | 400 | 480 | 600 |  |  |  |  |  |                           | D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 375 |  |  |  |  |  |                           | D1 | 65 | 75 | 85 | 100 | 110 | 125 | 145 | 160 | 190 | 220 | 250 | 320 |  |  |  |  |  |                           | D2 | 45 | 55 | 65 | 78 | 85 | 100 | 120 | 135 | 160 | 188 | 218 | 282 |  |  |  |  |  |                           | D6 | 40 | 51 | 58 | 66 | 76 | 88 | 110 | 121 | 150 | 176 | 204 | 260 |  |  |  |  |  |                           | Z-Φd | 4-14 | 4-14 | 4-14 | 4-18 | 4-18 | 4-18 | 8-18 | 8-18 | 8-23 | 8-25 | 8-25 | 12-30 |  |  |  |  |  |                           | 64C | L | 170 | 190 | 210 | 230 | 260 | 300 | 340 | 380 | 430 |  |  |  |  |  |  |  |  |                           | D | 105 | 125 | 135 | 150 | 165 | 175 | 200 | 210 | 250 |  |  |  |  |  |  |  |  |                           | D1 | 75 | 90 | 100 | 110 | 125 | 135 | 160 | 170 | 200 |  |  |  |  |  |  |  |  |                           | D2 | 55 | 68 | 78 | 82 | 95 | 105 | 130 | 140 | 168 |  |  |  |  |  |  |  |  |                           | D6 | 40 | 51 | 58 | 66 | 76 | 88 | 110 | 121 | 150 |  |  |  |  |  |  |  |  |                           | Z-Φd | 4-14 | 4-18 | 4-18 | 4-23 | 4-23 | 4-23 | 8-23 | 8-23 | 8-25 |  |  |  |  |  |  |  |  |                           | 100C | L | 170 | 190 | 210 | 230  | 260 | 300 | 340 | 380 | 430 |  |  |  |  |  |  |  |  |                           | D | 105 | 125 | 135 | 150 | 165 | 195 | 220 | 230 | 265 |  |  |  |  |  |  |  |  |                           | D1 | 75 | 90 | 100 | 110 | 125 | 145 | 170 | 180 | 210 |  |  |  |  |  |  |  |  |                           | D2 | 55 | 68 | 78 | 82 | 95 | 112 | 138 | 148 | 172 |  |  |  |  |  |  |  |  |                           | D6 | 40 | 51 | 58 | 66 | 76 | 88 | 110 | 121 | 150 |  |  |  |  |  |  |  |  |                           | Z-Φd | 4-14 | 4-18 | 4-18 | 4-23 | 4-23 | 4-25 | 8-25 | 8-25 | 8-30 |  |  |  |  |  |  |  |  |  |