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API止回阀
API止回阀,美标止回阀
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。
止回阀一般分为升降式、旋启式等几种类型。
升降式止回阀的结构一般与截止阀相似，其阀瓣沿着通道中心线作升降运动，动作可靠，但流体阻力较大，适用于较小口径的场合。升降式止回阀可分为直通式和立式两种。直通式升降式止回阀一般只能安装在水平管路，而立式升降止回阀一般应安装在垂直管路。
旋启式止回阀的阀瓣绕转轴作旋转运动。其流体阻力一般小于升降式止回阀，它适用于较大口径的场合。旋启式止回阀根据阀瓣的数目可分为单瓣旋启式、双瓣旋启式及多瓣旋启式三种。单瓣旋启式止回阀一般适用于中等口径的场合。大口径管路选用单瓣旋启式止回阀时，为减少水锤压力，最好采用能减小水锤压力的缓闭止回阀。双瓣旋启式止回阀适用于大中口径管路。对夹双瓣旋启式止回阀结构小、重量轻，是一种发展较快的止回阀；多瓣旋启式止回阀适用于大口径管道路。
主要零件材料及性能规范
|
主 要 零 部 件 |
阀体、阀盖、摇杆 |
WCB |
CF8 |
CF |
WC6、WC9 |
|
阀瓣 |
WCB堆Cr13或硬质合金 |
CF8堆硬质合金 |
CF |
WC6、WC9堆硬质合金 |
|
|
阀座 |
25堆Cr13或硬质合金 |
304堆硬质合金 |
316堆硬质合金 |
20Cr1MoV堆硬质合金 |
|
|
垫片 |
软铁、XB450 |
聚四氟乙烯 |
聚四氟乙烯 |
不锈钢+耐酸石棉缠绕垫 |
|
|
螺栓 |
35CrMoA |
35CrMoA |
35CrMoA |
25Cr1Mo1V |
|
|
螺母 |
45 |
45 |
45 |
35CrMoA |
|
|
主要参数 |
适用介质 |
油品、水、蒸汽 |
硝酸类 |
醋酸类 |
油品、水、蒸汽 |
|
适用温度
℃ |
≤425 |
≤200 |
≤200 |
≤550 |
|
型 号 |
公称
通径
NPS(in) |
压力级Class |
主要结构尺寸(mm) |
阀体
材料 |
简要性能 |
||||
|
D |
L |
H |
(℃) |
适用介质 |
|||||
|
SFH |
11/2" |
300 |
156 |
241 |
|
WCB |
≤425 |
水、油品、蒸气、等 |
|
|
" |
2" |
" |
165 |
267 |
|
" |
" |
" |
|
|
" |
21/2" |
" |
190 |
292 |
|
" |
" |
" |
|
|
" |
3" |
" |
210 |
318 |
|
" |
" |
" |
|
|
" |
4" |
" |
254 |
356 |
|
" |
" |
" |
|
|
" |
5" |
" |
279 |
400 |
|
" |
" |
" |
|
|
" |
6" |
" |
318 |
445 |
|
" |
" |
" |
|
|
" |
8" |
" |
381 |
533 |
|
" |
" |
" |
|
|
" |
10" |
" |
445 |
622 |
|
" |
" |
" |
|
|
" |
12" |
" |
521 |
711 |
|
" |
" |
" |
|
|
" |
14" |
" |
584 |
838 |
|
" |
" |
" |
|
|
" |
16" |
" |
648 |
864 |
|
" |
" |
" |
|
|
" |
18' |
" |
711 |
978 |
|
" |
" |
" |
|
|
" |
20' |
" |
775 |
1016 |
|
" |
" |
" |
|
|
" |
24" |
" |
914 |
1346 |
|
" |
" |
" |
|
|
SFH |
11/2" |
150 |
127 |
165 |
150 |
WCB |
≤425 |
水、油品、蒸气、等 |
|
|
" |
2" |
" |
152 |
203 |
170 |
" |
" |
" |
|
|
" |
21/2" |
" |
178 |
216 |
180 |
" |
" |
" |
|
|
" |
3" |
" |
190 |
241 |
185 |
" |
" |
" |
|
|
" |
4" |
" |
229 |
292 |
215 |
" |
" |
" |
|
|
" |
5" |
" |
254 |
330 |
240 |
" |
" |
" |
|
|
" |
6" |
" |
279 |
356 |
260 |
" |
" |
" |
|
|
" |
8" |
" |
343 |
495 |
300 |
" |
" |
" |
|
|
" |
10" |
" |
406 |
622 |
350 |
" |
" |
" |
|
|
" |
12" |
" |
483 |
699 |
400 |
" |
" |
" |
|
|
" |
14" |
" |
533 |
787 |
450 |
" |
" |
" |
|
|
" |
16" |
" |
597 |
864 |
480 |
" |
" |
" |
|
|
" |
18' |
" |
635 |
978 |
540 |
" |
" |
" |
|
|
" |
20' |
" |
699 |
978 |
600 |
" |
" |
" |
|
|
" |
24" |
" |
813 |
1295 |
680 |
" |
" |
" |
|
|
SFH |
11/2" |
300 |
156 |
241 |
160 |
WCB |
≤425 |
水、油品、蒸气、等 |
|
|
" |
2" |
" |
165 |
267 |
170 |
" |
" |
" |
|
|
" |
21/2" |
" |
190 |
292 |
185 |
" |
" |
" |
|
|
" |
3" |
" |
210 |
318 |
215 |
" |
" |
" |
|
|
" |
4" |
" |
254 |
356 |
235 |
" |
" |
" |
|
|
" |
5" |
" |
279 |
400 |
270 |
" |
" |
" |
|
|
" |
6" |
" |
318 |
445 |
300 |
" |
" |
" |
|
|
" |
8" |
" |
381 |
533 |
340 |
" |
" |
" |
|
|
" |
10" |
" |
445 |
622 |
350 |
" |
" |
" |
|
|
" |
12" |
" |
521 |
711 |
420 |
" |
" |
" |
|
|
" |
14" |
" |
584 |
838 |
480 |
" |
" |
" |
|
|
" |
16" |
" |
648 |
864 |
520 |
" |
" |
" |
|
|
" |
18' |
" |
711 |
978 |
600 |
" |
" |
" |
|
|
" |
20' |
" |
775 |
1016 |
670 |
" |
" |
" |
|
|
SFH |
24" |
300 |
914 |
1346 |
750 |
WCB |
≤425 |
水、油品、蒸气、等 |
|
|
SFH |
2" |
600 |
165 |
292 |
175 |
WCB |
≤425 |
水、油品、蒸气、等 |
|
|
" |
21/2" |
" |
190 |
330 |
200 |
" |
" |
" |
|
|
" |
3" |
" |
210 |
356 |
230 |
" |
" |
" |
|
|
" |
4" |
" |
254 |
432 |
295 |
" |
" |
" |
|
|
" |
6" |
" |
318 |
559 |
360 |
" |
" |
" |
|
|
" |
8" |
" |
381 |
660 |
400 |
" |
" |
" |
|
|
" |
10" |
" |
445 |
787 |
460 |
" |
" |
" |
|
|
" |
12" |
" |
520 |
838 |
520 |
" |
" |
" |
|
|
" |
14" |
" |
585 |
889 |
560 |
" |
" |
" |
|
|
" |
16" |
" |
650 |
991 |
650 |
" |
" |
" |
|
|
" |
18' |
" |
710 |
1092 |
730 |
" |
" |
" |
|
|
" |
20' |
" |
775 |
1192 |
800 |
" |
" |
" |
|
|
" |
24" |
" |
915 |
1397 |
900 |
" |
" |
" |
|
