Upper-mounted eccentric hemispherical Valve

Definition: An industrial valve designed with an eccentric structure (the valve body and the center axis of the sphere are offset), which drives the sphere to rotate around the axis through the valve stem to achieve opening and closing actions. It is suitable for harsh working conditions containing particles and corrosive media.


Core features:

Eccentric design: The ball is detached from the valve seat and rotates, reducing the wear of the sealing surface. The opening and closing torque is small, and it automatically centers when closed to form a tighter and tighter sealing effect.

Top mounted structure: The top is detachable and supports online maintenance (such as replacing valve seats and sealing rings) without the need to disassemble the entire valve.

Reliable sealing: The metal sealing pair (welded alloy) or non-metallic elastic material is embedded in the valve seat, which is wear-resistant and has self compensating ability.

Low flow resistance: When fully open, the flow cross-section is large, and the fluid resistance is close to that of a straight pipe section, reducing pressure loss.


Typical applications: Steel, aluminum, petroleum, chemical, sewage treatment and other scenarios that require treatment of fibers, pulp, gas, corrosive media or frequent maintenance.

  • Standardization and Safety
  • Adapt to complex working conditions
  • Low friction and light operation
  • Efficient sealing performance
  • Maintain convenience
Standardization and Safety
  • 01
    International standard compatibility
    Compliant with API, ASME and other standards, suitable for mainstream pipeline systems worldwide.
  • 02
    Anti leakage redundancy
    The surface hardness of the hard sealing pair reaches HRC65-72, with strong wear resistance; High temperature paint coating can withstand working conditions of 600 ℃, ensuring long-term stable operation.
Adapt to complex working conditions
  • 01
    High strength material
    The valve body is made of cast steel, stainless steel, or corrosion-resistant alloys (such as Hastelloy), which can withstand high temperatures (-196 ℃~600 ℃), high pressures, and strong corrosive media.
  • 02
    Low flow resistance design
    When fully open, the ball is hidden in the valve chamber, with a large flow cross-section and fluid resistance close to that of a straight pipe section, suitable for high flow scenarios.
Low friction and light operation
  • 01
    Eccentric design
    The ball rotates after detaching from the valve seat, reducing frictional resistance and reducing operating torque by more than 30%.
  • 02
    90 ° rotation control
    Fully open/close only requires a 90 ° rotation, supporting fast response and remote automation operation. 
Efficient sealing performance
  • 01
    Bidirectional sealing capability
    Regardless of the flow direction of the medium, it can achieve tight closure and prevent leakage.
  • 02
    Anti scaling and self compensation
    When the eccentric sphere is closed, shear the scaling material to keep the sealing surface clean; The metal sealing pair has an automatic wear compensation function, which extends its service life.
Maintain convenience
  • 01
    Top up structure
    During maintenance, there is no need to disassemble the entire valve. Simply open the valve cover to replace internal components (such as valve discs, sealing rings, etc.), greatly reducing downtime.
  • 02
    Modular design
    The sealing ring and other vulnerable parts adopt a movable structure, supporting quick disassembly and assembly, and reducing maintenance costs.
Main Component Materials

name

Material

valve body

WCB

ZG1Cr18Ni9Ti

ZG0Cr18Ni12Mo2Ti

ZG15Cr1Mo1V

back cover

Q235A

1Cr18Ni9Ti

0Cr18Ni12Mo2Ti

25Cr2Mo1V

bushing

SF_1

FB090

FB316

FB090

Lower valve stem

2Cr13

1Cr18Ni9Ti

0Cr18Ni12Mo2Ti

1Cr18Ni9Ti

sphere

WCB

ZG1Cr18Ni9Ti

ZG0Cr18Ni12Mo2Ti

ZG15Cr1Mo1V

pressure plate

Q235A

1Cr18Ni9Ti

0Cr18Ni12Mo2Ti

25Cr2Mo1V

valve seat

Q235A+PTFE

1Cr18Ni9Ti/PTFE

0Cr18Ni12Mo2Ti/PTFE

25Cr2Mo1V/PTFE

spherical crown

1Cr18Ni9Ti special treatment

1Cr18Ni9Ti special treatment

0Cr18Ni12Mo2Ti special treatment

1Cr18Ni9Ti special treatment

bushing

SF-1

FB090

FB316

FB090

Upper Stem

2Cr13

1Cr18Ni9Ti

0Cr18Ni12Mo2Ti

1Cr18Ni9Ti

Packing tray

WCB

ZG1Cr18Ni9Ti

ZG0Cr18Ni12Mo2Ti

ZG15Cr1Mo1V

valve cover

WCB

ZG1Cr18Ni9Ti

ZG0Cr18Ni12Mo2Ti

ZG15Cr1Mo1V

bolt

35

0Cr18Ni9

0Cr18Ni9

15Cr1Mo1V

nut

35

0Cr18Ni9

0Cr18Ni9

20CrMo

Fill Sea Science

flexible graphite

flexible graphite

flexible graphite

flexible graphite

cover pressing

WCB

ZG1Cr18Ni9Ti

ZG0Cr18Ni12Mo2Ti

ZG15Cr1Mo1V

support

WCB

WCB

WCB

WCB

Electric Actuator

assembly

Performance Specifications & Dimensions
  • Nominal pressure PN
    1.0/1.6/2.5/4.0/6.4/10.0/16.0
  • Shell F
    P x 1.5
  • Sealing Pressure
    P x 1.1
  • Medium
    Natural gas, steam, oil products, acids, alkalis, coal powder, coal ash, waste residue, mud, various media containing particles, fibers, etc
  • Temperature (℃)
    Soft seal -40 ℃~200 ℃/Hard seal -29 ℃~600 ℃

Nominal Diameter
DN(mm)

PN1.0MPa

L

D

D1

D2

b

f

Z-Φd0

Hw

Hd

50

178

165

125

100

18

2

4-18

270

310

65

190

180

145

120

18

2

4-18

280

320

80

203

195

160

135

20

2

4-18

290

330

100

229

220

180

156

22

2

8-18

330

380

125

254

250

210

184

22

2

8-18

345

405

150

267

285

240

211

24

2

8-22

370

440

200

292

340

295

266

24

2

8-22

405

470

250

330

395

350

319

26

2

12-22

480

540

300

356

445

400

370

26

2

12-22

520

580

350

430

505

460

429

26

2

16-22

570

630

400

530

565

515

480

26

2

16-26

630

710

450

580

615

565

530

28

2

20-26

690

770

500

660

670

620

582

28

2

20-26

740

820

600

840

780

725

682

34

2

20-30

840

940

700

900

895

840

794

34

2

24-30

960

1040

800

1000

1015

950

901

36

5

24-33

1080

1180

Note: The above data is for reference only. For details, please consult the company's sales department.

Valve Application
  • Oil & Gas Transportation

    Oil and gas transportation involves multiple modes such as pipelines and ships, and is the core link of the energy supply chain.

  • Chemical Raw Material Control

    The control of chemical raw materials covers the entire process of mining, storage, and production, ensuring safety and process stability.

  • High Temperature SteamPipeline in Power System

    High temperature steam pipelines are the core of energy transmission in power systems, supporting the efficient operation of thermal and nuclear power plants.

  • Other Industries

    Valves control fluids in multiple industries such as new energy and electronics, ensuring safe and efficient production.

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