截止阀是一种常用的截断阀，主要用来接通或截断管路中的介质，一般不用于调节流量。截止阀适用的压力、温度范围很大，但一般用于中、小口径的管道。
截止阀的主要优点：
1）与闸阀相比，截止阀的结构较简单，制造与维修都较方便。
2）密封面不易磨损、擦伤，密封性较好，寿命较长。
3）启闭时阀瓣行程较小，启闭时间较短，阀门高度较小。
主要零件材料及性能规范
|
主要零部件 |
阀体 阀盖 |
碳钢 |
铬镍钛不锈钢 |
铬镍钼钛不锈钢 |
超低碳不锈钢 |
铬钼合金钢 |
低温碳钢 | ||
|
阀瓣 阀座 |
碳钢堆焊硬质合金或不锈钢 |
铬镍钛不锈钢 堆焊硬质合金 |
铬镍钼钛不锈钢 堆焊硬质合金 |
超低碳不锈钢 |
铬钼合金钢 堆焊硬质合金 |
不锈钢堆焊硬质合金 | |||
|
阀杆 |
铬不锈钢 |
铬镍钛不锈钢 |
铬镍钼钛不锈钢 |
超低碳不锈钢 |
铬钼合金钢 |
不锈钢 | |||
|
填料 |
石墨石棉盘根 |
浸聚四氟乙烯石棉盘根 |
柔性石墨石棉盘根 |
浸聚四氟乙烯石棉盘根 | |||||
|
垫片 |
石棉垫片 |
不锈钢带四氟乙烯缠绕垫片 |
柔性石墨+不锈钢 |
聚四氟乙烯 | |||||
|
阀杆螺母 |
高镍球铁/ZguAL10Fe3 | ||||||||
|
主要参数 |
适用介质 |
水、蒸汽、油品 |
硝酸类 |
醋酸类 |
尿素、甲铵液等 |
水、蒸汽、石油及石油产品 |
氨气、液氨 | ||
|
适用温度℃ |
≤425 |
≤200 |
≤200 |
≤200 |
≤550 |
-45～150 | |||
|
型号 |
公称 通径 NPS(in) |
压力级 Class |
主要结构尺寸(mm) |
阀体 材料 |
性能规范 | ||||
|
Do |
D |
L |
H |
适用温度(℃) |
适用介质 | ||||
|
SFJ |
2" |
150 |
200 |
|
203 |
380 |
WCB |
≤425 |
蒸气、油品、水等 |
|
" |
3" |
" |
250 |
|
241 |
465 |
" |
" |
" |
|
'' |
4" |
" |
300 |
|
292 |
530 |
" |
" |
" |
|
" |
6" |
" |
350 |
|
406 |
650 |
" |
" |
" |
|
" |
8" |
" |
400 |
|
495 |
760 |
" |
" |
" |
|
" |
10" |
" |
500 |
|
622 |
860 |
" |
" |
" |
|
" |
12" |
" |
600 |
|
699 |
1000 |
" |
" |
" |
|
" |
14" |
" |
600 |
|
787 |
1050 |
" |
" |
" |
|
" |
16" |
" |
750 |
|
914 |
1150 |
" |
" |
" |
|
SFJ |
2" |
300 |
200 |
|
267 |
425 |
WCB |
≤425 |
蒸气、油品、水等 |
|
" |
3" |
" |
250 |
|
318 |
530 |
" |
" |
" |
|
" |
4" |
" |
300 |
|
356 |
610 |
" |
" |
" |
|
" |
6" |
" |
400 |
|
445 |
790 |
" |
" |
" |
|
" |
8" |
" |
500 |
|
559 |
870 |
" |
" |
" |
|
" |
10" |
" |
500 |
|
622 |
1040 |
" |
" |
" |
|
" |
12" |
" |
600 |
|
711 |
1140 |
" |
" |
" |
|
" |
14" |
" |
750 |
|
838 |
1200 |
" |
" |
" |
|
" |
16" |
" |
850 |
|
864 |
1400 |
" |
" |
" |
|
SFJ |
2" |
600 |
250 |
|
292 |
475 |
WCB |
≤425 |
蒸气、油品、水等 |
|
" |
3" |
" |
300 |
|
356 |
585 |
" |
" |
" |
|
" |
4" |
" |
350 |
|
432 |
675 |
" |
" |
" |
|
" |
6" |
" |
450 |
|
559 |
885 |
" |
" |
" |
|
" |
8" |
" |
500 |
|
660 |
945 |
" |
" |
" |
|
" |
10" |
" |
600 |
|
787 |
1040 |
" |
" |
" |
|
" |
12" |
" |
750 |
|
838 |
1280 |
" |
" |
" |
|
" |
14" |
" |
850 |
|
889 |
1350 |
" |
" |
" |
|
" |
16" |
" |
960 |
|
991 |
1550 |
" |
" |
" |
注：焊接坡口尺寸按相关标准或按用户要求执行。
