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
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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,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

 

阀体、阀盖、摇杆

WCB

CF8

CF 8M

WC6WC9

阀瓣

WCBCr13或硬质合金

CF8堆硬质合金

CF 8M 堆硬质合金

WC6WC9堆硬质合金

阀座

25Cr13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

 

 

 

 

 

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 -41C 300C

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 -44C 150C

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 -44C 300C

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 -44C 300C

24"

300

914

1346

750

WCB

425

水、油品、蒸气、等

SFH -44C 600C

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

"

"

"

 

 


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