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Eccentric hemisphere valve
Product model: DYQ40
Nominal diameter: DN100 ~ 1400mm
Nominal pressure: PN1.0 ~ 1.6MPa
Main material: carbon steel WCB / stainless steel CF8
Applicable medium: natural gas, coal gas, liquefied gas, crude oil, heavy oil
Applicable temperature: ≤425 ℃
Flange connection size: GB / T 9113.1-2000.ASME / ANSI 16.5
Structure length: GB 12221-2005, ASNE B16.10
Manufacturing and acceptance: GB12237-89, API 6D
Pressure test according to JB / T9092-1999, GB / T13927-92, AP1598

Product introduction:

The top-loading eccentric hemisphere valve is suitable for strictly prohibited occasions such as sewage treatment, pulp, alumina, urban heating and heating, oil, natural gas, liquid and solid two-phase mixed or medium that is easy to crystallize. Can replace: General purpose valve, special valve for petrochemical industry, special valve for gas, special valve for slurry, special valve for coal ash and so on.

The top-loading eccentric hemisphere valve adopts the principle of eccentric structure, and achieves the purposes of brake tightness, adjustment and closure through the transmission mechanism. When the double eccentric structure ball valve is opened, the ball is hidden in the valve cavity, and the flow carrying surface is large. When the valve is closed, the spherical surface of the valve core is progressive along the valve seat. It has a shear function, which effectively removes the fouling obstacle and achieves a reliable seal.

Working principle of eccentric hemisphere valve:

This series of ball valve is the crystallization of the spiritual change of the traditional ball valve. It fixes the metal ball crown on the eccentric ball. The valve is opened and closed by 90-degree rotation of the eccentric crankshaft. The metal valve seat in contact with the sealing surface of the metal ball crown is Axial and radial floats to compensate for ball crowns and valve seats. The simple and reliable structure and effective sealing method not only can replace the gate valve with advantages, but also can be used in unusable systems. It can be promoted and applied to petroleum, chemical, power and metallurgy industries. Its core technology is the first in China, and it has a unique design and novel structure. Its structure adopts the principle of eccentric tightening to achieve the purpose of brake tightening, adjustment and closing through a transmission mechanism. The sealing pair is a metal surface ring with a hard surface contact seal. When the double eccentric structure is opened, the valve core is located in the Tibetan ball chamber, and the cross section is large. The valve is not flushed, the valve core is not flushed when closed, and the spherical surface of the valve core is progressive along the valve seat when opened, effectively removing the fouling obstacle and achieving a reliable seal. It is particularly effective for mixed-flow conveyance of two-phase mixed-flow solid-scale deposits.

Product features of eccentric hemisphere valve:

1. Tight seal, no leakage of harmful gas.

2. The valve's hemisphere is made of bimetal. The base material is superimposed with different alloys. The valve seat is also superimposed with special treatment. The sealing surface is combined into various types such as anti-corrosion, abrasion resistance and high strength to meet the needs of different occasions. .

3. The valve core of the sealing pair has a compensation amount. When the valve is worn, it can be turned a little when it is closed, which can reliably seal and prolong the service life. In addition, the user can unscrew the compression nut, and the valve seat can still be used after adjustment or replacement, which avoids the disadvantage of the entire unit being scrapped after the valve seal fails.

4. The structure adopts the principle of eccentric tightening to achieve the purpose of brake tightening, adjustment and closing through the transmission mechanism. The sealing pair is a metal surface ring with a hard surface contact seal. When the double eccentric structure is opened, the valve core is located in the Tibetan ball chamber with a large cross-section. And the valve is not flushed, the valve core is not flushed when closed, and the spherical surface of the valve core is progressive along the valve seat when opened, which effectively cuts off the fouling obstacle and achieves a reliable seal. It is particularly effective for mixed-flow conveyance of two-phase mixed-flow solid-scale deposits.

Main performance specifications:

Nominal pressure

0.6

1.0

1.6

2.0

2.5

4.0

5.0

6.4

10

Shell test pressure

0.9

1.5

2.4

3.0

3.8

6.0

7.5

9.6

15

High pressure seal test

0.66

1.1

1.8

2.2

2.8

4.4

5.5

7.1

11

Applicable medium and temperature ℃

DYQ40 type

Water, steam, pulp and other solutions t≤180 ℃

DYQ40 type

Natural gas, coal gas, liquefied gas, crude oil, heavy oil t ≤425 ℃

DYQ40 type

Solution, pulp, alumina powder, pulverized coal, coal ash, dusty gas, waste residue, etc. t ≤300 ℃

☆ Material and code of main parts

Part Name

DYQ40 type

DYQ40 type

DYQ40 type

Valve body

Carbon steel WCB / stainless steel CF8

Carbon steel WCB / stainless steel CF8

Carbon steel WCB / stainless steel CF8

Valve stem

2Cr13 / 304

2Cr13 / 304

2Cr13 / 304

Spool sealing pair

WCB / CF8 + Cr

WCB / CF8 + hardened alloy steel

Special hardened alloy steel
JK117 / 17Co alloy

Valve seat seal pair

PTFE / Molon

WCB / CF8 + hardened alloy steel

Special hardened alloy steel
JK117 / 17Co alloy


Nominal pressure
PN

Nominal diameter
DN (mm)

Size (mm)

L

D

K

d

b

z-d0

Hw

Hd

1.0MPa

100

229

220

180

156

twenty two

8-φ18

330

380

125

254

210

210

184

twenty two

8-φ18

345

405

150

267

240

240

211

twenty four

8-φ22

370

440

200

292

295

295

266

twenty four

8-φ22

405

470

250

330

350

350

319

26

12-φ22

480

540

300

403

400

400

370

26

12-φ22

520

580

350

430

460

460

429

26

16-φ22

570

630

400

530

515

515

480

26

16-φ26

630

710

450

580

565

565

530

28

20-φ26

690

770

500

660

620

620

582

28

20-φ26

740

820

600

840

725

725

682

34

20-φ30

840

940

700

900

840

840

794

34

24-φ30

960

1040

800

1000

950

950

901

36

24-φ33

1080

1180

900

1100

1050

1050

1001

38

28-φ33

1190

1280

1000

1200

1160

1160

1112

38

28-φ36

1310

1420

1200

1300

1380

1380

1328

44

32-φ39

1420

1530

1400

1500

1590

1590

1530

48

36-φ42

1540

1650

1.6MPa

100

229

180

180

156

twenty two

8-φ18

330

380

125

254

210

210

184

twenty two

8-φ18

345

405

150

267

240

240

211

twenty four

8-φ22

370

440

200

292

295

295

266

twenty four

12-φ22

405

470

250

330

355

355

319

26

12-φ26

480

540

300

403

410

410

370

28

12-φ26

520

580

350

430

470

470

429

30

16-φ26

570

630

400

530

525

525

480

32

16-φ30

630

710

450

580

650

585

548

40

20-φ30

690

770

500

660

770

650

609

44

20-φ33

740

820

600

840

840

770

720

54

20-φ36

840

940

700

900

950

840

794

40

24-φ36

960

1040

800

1000

1050

950

901

42

24-φ39

1080

1180

900

1100

1125

1050

1001

44

28-φ39

1190

1280

1000

1200

1255

1170

1112

46

28-φ42

1310

1420

1200

1300

1485

1390

1328

52

32-φ48

1420

1530

1400

1500

1590

1590

1530

58

36-φ48

1540

1650

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