此类型专用低温紧急切断阀适用于低温贮槽上切断流通介质，特别是在出现火情故障时能及时切断介质。广泛用于LNG、液态乙烯及其它低温介质，具有体积小、重量轻、密封可靠、紧急切断迅速可靠和防静电的特点。
This type is special emergency cut-off valve is suitable for low temperature storage tank at low temperature on cut off circulation medium, especially in the event of a fire failure can promptly cut off the medium. Widely used in LNG, ethylene and other low temperature liquid medium, has small volume, light weight, reliable sealing, reliable emergency stop quickly and anti-static characteristics.
主要技术参数 Main technical parameters
公称压力/Nominal pressure：4.0MPa
设计温度/Design temperature：-196℃～+70℃
适用介质/Applicable medium：LNG 、LO2、LN2、LAr
连接方式/Connection method：插焊
公称通径/Nominal diameter：25mm~50mm
强度试验压力/Strength test pressure：4.0MPa
气密性试验压力/Air tightness test pressure：1.6MPa
方向密封试验压力/direction of seal test pressure：0.4MPa
气缸气源压力/Air pressure cylinder：0.4～0.6MPa
紧急切断温度/Emergency cut-off temperature：+70℃
紧急切断时间/Emergency cut-off time：<2秒
| 主要零部件名称 Main components name | 材料 Materials |
| 阀体/Valve body | ZG0Cr18Ni9 |
| 阀瓣/Valve disc | 0Cr18Ni9Ti |
| 阀盖/Valve cover | ZG0Cr18Ni9 |
| 阀杆/Valve stem | 0Cr18Ni9 |
| 主密封件/Main seal | PTFE或PCTFE |
| 气缸/cylinder | 铸铝 |
| 支架/stents | 铸铝 |
| 型号/Model | 主要外形和连接尺寸 Main form and the connection size (mm) | 重量 Weight | ||||||||
| H | H1 | D0 | D1 | D | B | W1 | W2 | M | （kg） | |
| DJQ-20P | 189 | 478 | Ф20 | Ф25.5 | Ф100 | 8 | 80 | Ф130 | Rc¼ | 7.2 |
| DJQ-25P | 240 | 530 | Ф25 | Ф32.5 | Ф100 | 8 | 90 | Ф130 | Rc¼ | 7.7 |
| DJQ-32P | 250 | 489 | Ф32 | Ф38.5 | Ф100 | 8 | 105 | Ф130 | Rc¼ | 7.3 |
| DJQ-40P | 227 | 567 | Ф40 | Ф45.5 | Ф125 | 8 | 120 | Ф160 | Rc¼ | 13.2 |
| DJQ-50P | 230 | 570 | Ф50 | Ф57.5 | Ф125 | 10 | 140 | Ф160 | Rc¼ | 14.5 |
