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| 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。 |
执行标准 Administer Standard
种类 Type | 设计与制造 Design And Manufacture | 结构长度 Face to face | 法兰尺寸 Flange Dimension | 压力-温度 Pressure Temperature Lating | 试验-检验 Znspection And Test |
| 旋启式止回阀 Swing Check Valve | BG12236 | GB12221 | GB9113 JB79 | GB9131 | GB/T13927 JB/T9092 |
| 升降式止回阀 Lift Check Valve | GB12235 |
<压力试验MPa Pressure Test
公称压力 Nominal Pressure | 1.6 | 2.5 | 4.0 | 6.4 | 10.0 | 16.0 |
| 强度试验 Shell Test | 2.4 | 3.8 | 6.0 | 9.6 | 15.0 | 24.0 |
| 水密封试验 Water Seal Test | 1.8 | 2.8 | 4.4 | 7.0 | 11.0 | 18.0 |
| 气密封试验 Air Seal Test | 0.5-0.7 | |||||
<主要零件材料及性能 Main Part Materials and Property
体、盖、瓣 Body Cover Disc | 阀杆 Stem | 密封面 Sealing Face | 垫片 Sealing Shim | 密封面 Sealing Face | 工作温度℃ Working Temperature | 适用介质 Suitable Medium |
| WCB | WCB | 1Cr13 | 增强柔性石墨 1Cr13/柔性石墨 不锈钢/耐酸石棉 PTFE 齿型垫片 Enhanced Flexiblo Graohite 1Cr13/ Flexiblo Graohite Stainless Steel/Acid- proof Asbestos tooth profile gasket | 13Cr STL 本体材料 With Body Material PTFE 尼龙 Nylon | ≤425 | 水 蒸汽 油品 Water Steam Oil Googs |
| WC6 | WC6 | ≤540 | ||||
| WC9 | WC9 | ≤570 | ||||
| ZGCr5Mo | ZGCr5Mo | ≤550 | ||||
| ZG1Cr18Ni9Ti | ZG1Cr18NTi | 1Cr18Ni9Ti | ≤200 | 硝酸类Nitric Acid | ||
| ZG1Cr18Ni12Mo2Ti | ZG1Cr18Ni12Mo2Ti | 1Cr18Ni12Mo2Ti | ≤200 | 硝酸类Nitric Acid |
规格主要尺寸和重量 Size Main Dimension and Weight （mm Kg）
| 1.6MPa | DN | L | D | D1 | D2 | b | n-Φd | H | W（㎏） |
| 凸面法兰 RF H41H H41Y H41W H41N 16C 16P 16R | 15 | 130 | 95 | 65 | 45 | 14 | 4-14 | 58 | 2.0 |
| 20 | 150 | 105 | 75 | 55 | 14 | 4-14 | 63 | 2.7 | |
| 25 | 160 | 115 | 85 | 65 | 14 | 4-14 | 71 | 3.5 | |
| 32 | 180 | 135 | 100 | 78 | 16 | 4-18 | 84 | 5.4 | |
| 40 | 200 | 145 | 110 | 85 | 16 | 4-18 | 96 | 6.5 | |
| 50 | 230 | 160 | 125 | 100 | 16 | 4-18 | 115 | 9.1 | |
| 65 | 290 | 180 | 145 | 120 | 18 | 4-18 | 145 | 14 | |
| 80 | 310 | 195 | 160 | 135 | 20 | 8-18 | 156 | 25 | |
| 100 | 350 | 215 | 180 | 155 | 20 | 8-18 | 170 | 40 | |
| 125 | 400 | 245 | 210 | 185 | 22 | 8-18 | 201 | 56 | |
| 150 | 480 | 280 | 240 | 210 | 24 | 8-23 | 238 | 90 | |
| 2.5MPa | 15 | 130 | 95 | 65 | 45 | 16 | 4-14 | 60 | 4 |
| 凸面法兰 RF H41H H41Y H41W H41N 25 25P 25R | 20 | 150 | 105 | 75 | 55 | 16 | 4-14 | 64 | 5 |
| 25 | 160 | 115 | 85 | 65 | 16 | 4-14 | 68 | 6 | |
| 32 | 180 | 135 | 100 | 78 | 18 | 4-18 | 79 | 9 | |
| 40 | 200 | 145 | 110 | 85 | 18 | 4-18 | 98 | 12 | |
| 50 | 230 | 160 | 125 | 100 | 20 | 4-18 | 110 | 16 | |
| 65 | 290 | 180 | 145 | 120 | 22 | 8-18 | 160 | 24 | |
| 80 | 310 | 195 | 160 | 135 | 22 | 8-18 | 170 | 31 | |
| 100 | 350 | 230 | 190 | 160 | 24 | 8-23 | 195 | 45 | |
| 125 | 400 | 270 | 220 | 188 | 28 | 8-25 | 225 | 68 | |
| 150 | 480 | 300 | 250 | 218 | 30 | 8-25 | 255 | 100 |
