d671x epdm seat cast iron ci body wafer butterfly valve

Pneumatic actuator

Double acting,single acting

Nominal diameter

DN50-DN600

Nominal pressure

1.0-1.6MPa

Applicable temperature

PTFE:-30~150°C EPDM: -30~120°C NBR: -30~80°C

Connection

Wafer,lugs

Body material

Ductile iron, Cast iron, WCB, SS304,SS316,SS316L

Disc material

304,316,316L,nylon,cast steel

Seat lining

EPDM,NBR,PTFE

Diameter (mm)

Inch

Size (mm)

L

D1

D2

H1

H2

50

2

43

52.6

125

142

80

65

2 1/2

46

64.4

145

155

89

80

3

46

78.9

160

161

95

100

4

52

104.1

180

180

114

125

5

56

123.4

210

193

127

150

6

56

155.9

240

205

139

200

8

60

202.8

295

250

175

250

10

68

250.8

350

282

203

300

12

78

301.9

400

326

242

350

14

78

334

460

358

267

400

16

102/88

390

515

380

301

450

18

114/107

441

565

422

381

500

20

127

492

620

479

387

600

24

154

593

725

562

457

Double acting working principle:

1. Compressed air access into A holes, then the piston separates;
2. So that the drive shaft anticlockwise, valve open;
3. Air remove from B hole;

 1.    Compressed air access into B holes,  

        then the piston will be closer;

2.     So that the drive shaft clockwise, valve close;

3.     Air remove from A hole;

Single acting working principle:

1. Compressed air access into A hole, then the piston will be separates;
2. Spring will be stressed, so that the drive shaft anticlockwise, valve open;
3. Air remove from the B hole;

1.  Air remove from the A hole;

2.  Compression spring moves the pistons closer;

3.  Driven shaft clockwise;

4.  Air into from the B hole;