详细说明
截止阀属于强制密封式阀门，所以在阀门关闭时，必须向阀瓣施加压力，以强制密封面不泄漏。当介质由阀瓣下方进入阀门时，操作力所需要克服的阻力，是阀杆和填料的摩擦力与由介质的压力所产生的推力，关阀门的力比开阀门的力大，所以阀杆的直径要大，否则会发生阀杆顶弯的故障。近年来，从自密封的阀门出现后，截止阀的介质流向就改由阀瓣上方进入阀腔，这时在介质压力作用下，关阀门的力小，而开阀门的力大，阀杆的直径可以相应地减少。同时，在介质作用下，这种形式的阀门也较严密。我国阀门“三化给”曾规定，截止阀的流向，一律采用自上而下。
截止阀开启时，阀瓣的开启高度，为公称直径的25%～30%时，流量已达到最大，表示阀门已达全开位置。所以截止阀的全开位置，应由阀瓣的行程来决定。
| 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 Inspection And Test |
| GB122235 | GB12221 | GB9113 JB79 | GB9131 | GB/T13927 JB/T9092 |
法兰式截止阀压力试验 Pressure Test
| 公称压力NominalPressure | 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 |
| 上密封试验Backseat 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 |
法兰式截止阀主要零件材料及性能 Main Part Materials and Property
| 体、盖、板 Body Cover Disc | 阀杆Stem | 密封面 Sealing Face | 垫片SealingShim | 填料Packing | 工作温度℃ Working Temperature | 适用介质Suitable Medium | |
| WCB | 2Cr13 | 13CrSTL木体材料With BodyMaterial尼龙Nylon | 增强柔性石墨Enhanced Flexible Graphite13Cr/柔性石墨1Cr13/Flexible Graphite08软钢08 Soft Steal0Cr18Ni9Ti0Cr17Ni12Mo2TiXD550F(T)PTFE | 柔性石墨增强柔性石墨Flexible GraphiteEnhanced Flexible GraphiteSFB/260SFP/260PTFE | ≤425 | 水蒸汽油品WaterSteamPetroleumPtoducts | |
| WC1 | 38CrMoAl25Cr2MoV | ≤450 | |
| WC6 | ≤540 | |
| WC9 | ≤570 | |
| C5 C12 | ≤540 | |
| ZGCr5Mo | ≤200 | 硝酸类Nitric acid | |
| ZG1Cr18Ni9Ti | 1Cr18Ni9Ti | |
| ≤200 | 醋酸类Acetic acid | |
| ZG1Cr18Ni12Mo2Ti | 1Cr18Ni12Mo2Ti | |
法兰式截止阀规格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
| 1.6MPa | DN | L | D | D1 | D2 | b | n-φd | H | Do | 重量 Weight |
| 凸面法兰RFJ41HJ41YJ41WJ41FJ41N16C16P16R16I | 10 | 130 | 90 | 60 | 40 | 14 | 4-14 | 198 | 120 | 4.9 |
| 15 | 130 | 95 | 65 | 45 | 14 | 4-14 | 218 | 120 | 5.3 |
| 20 | 150 | 105 | 75 | 55 | 14 | 4-14 | 258 | 140 | 7.0 |
| 25 | 160 | 115 | 85 | 65 | 14 | 4-14 | 275 | 160 | 7.4 |
| 32 | 180 | 135 | 100 | 78 | 16 | 4-18 | 280 | 180 | 8.3 |
| 40 | 200 | 145 | 110 | 85 | 16 | 4-18 | 330 | 200 | 12.6 |
| 50 | 230 | 160 | 125 | 100 | 16 | 4-18 | 350 | 240 | 14 |
| 65 | 290 | 180 | 145 | 120 | 18 | 4-18 | 400 | 280 | 22.7 |
| 80 | 310 | 195 | 160 | 135 | 20 | 8-18 | 355 | 280 | 29 |
| 100 | 350 | 215 | 180 | 155 | 20 | 8-18 | 415 | 320 | 32.8 |
| 125 | 400 | 245 | 210 | 185 | 22 | 8-18 | 460 | 360 | 79.5 |
| 150 | 480 | 280 | 240 | 210 | 24 | 8-23 | 510 | 400 | 93 |
| 200 | 600 | 335 | 295 | 265 | 26 | 12-23 | 710 | 400 | 179 |
| 250 | 622 | 405 | 355 | 320 | 30 | 12-25 | 786 | 450 | 441 |
| 300 | 698 | 460 | 410 | 375 | 30 | 12-25 | 925 | 500 | 646 |
法兰式截止阀规格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
| 2.5MPa | DN | L | D | D1 | D2 | b | n-φd | H | Do | 重量 Weight |
| 凸面法兰RFJ41HJ41YJ41WJ41FJ41N16C16P16R16I | 10 | 130 | 90 | 60 | 40 | 16 | 4-14 | 198 | 120 | 4.9 |
| 15 | 130 | 95 | 65 | 45 | 16 | 4-14 | 218 | 120 | 5.3 |
| 20 | 150 | 105 | 75 | 55 | 16 | 4-14 | 258 | 140 | 7.0 |
| 25 | 160 | 115 | 85 | 65 | 16 | 4-14 | 275 | 160 | 7.4 |
| 32 | 180 | 135 | 100 | 78 | 18 | 4-18 | 280 | 180 | 8.3 |
| 40 | 200 | 145 | 110 | 85 | 18 | 4-18 | 330 | 200 | 12.6 |
| 50 | 230 | 160 | 125 | 100 | 20 | 8-18 | 350 | 240 | 16 |
| 65 | 290 | 180 | 145 | 120 | 22 | 8-18 | 400 | 280 | 25 |
| 80 | 310 | 195 | 160 | 135 | 22 | 8-23 | 355 | 280 | 30 |
| 100 | 350 | 230 | 190 | 160 | 24 | 8-25 | 415 | 320 | 34.8 |
| 125 | 400 | 270 | 220 | 188 | 28 | 8-25 | 460 | 360 | 89.5 |
| 150 | 480 | 300 | 250 | 218 | 30 | 12-25 | 510 | 400 | 99 |
| 200 | 600 | 360 | 310 | 278 | 34 | 12-25 | 710 | 400 | 181 |
| 250 | 622 | 425 | 370 | 332 | 36 | 12-30 | 786 | 450 | 445 |
| 300 | 698 | 485 | 430 | 390 | 40 | 16-30 | 925 | 500 | 651 |