Welded Eccentric Hemisphere Valve
Keywords:
Valve Encyclopedia
Category:
- Product Description
-
The product's primary uses
● Universal valve for urban heating and heat supply Suitable for applications with stringent requirements, such as wastewater treatment and pulp processing.
· Oil and chemical industry-specific valve Suitable for various oil products such as crude oil and heavy oil, as well as corrosive and two-phase mixed media in the chemical industry. Temperature resistance up to 425℃.
· Gas-specific valve: Suitable for the control of gas, natural gas, and liquefied petroleum gas transmission. The product’s structural feature is that the sealing ring is built up by welding a chromium-containing alloy different from that used in conventional valves, ensuring tight sealing and excellent corrosion resistance.
· Slurry-specific valve: This product is suitable for industrial pipeline transportation involving two-phase mixtures—liquid and solid—or for liquid transport where chemical reactions result in crystal precipitation or scaling. The structural features of the product are tailored to meet customers’ specific requirements regarding the medium and temperature. The ball is built up by welding with chromium-molybdenum and vanadium alloys, while the valve seat is built up by welding with chromium-molybdenum alloys, chromium alloys, or stainless steel alloy electrodes, thus satisfying the needs of transporting various slurry media.
· Dedicated valve for coal ash and slag: Suitable for control applications in power plants, alumina processing, hydraulic slag removal systems, or gas-phase conveying pipelines. The product requires excellent wear resistance; the ball is made of a composite bimetallic material with exceptionally high rigidity and outstanding wear resistance. The valve seat is coated with a hardfacing alloy for enhanced wear resistance.
Performance Features
· Leak-free Since the valve body is made by integral casting, the sphere undergoes machining processes that are inspected by advanced computerized measuring instruments, ensuring extremely high machining accuracy. The valve seat features a floating design that automatically maintains the sealing position, enabling the valve to adapt effectively to changes in pressure and temperature. Within the specified pressure and temperature ranges, no leakage will occur.
· Save on installation costs and time. The directly buried welded hemispherical valve can be installed directly underground. Depending on the pipeline’s construction and design requirements, the length of the valve body and the height of the valve stem can be adjusted accordingly. There’s no need to build a tall valve pit—instead, only a small, shallow pit needs to be set up on the ground, significantly reducing construction costs and project time.
· Flexible operation: Due to the eccentric design, as the valve closes, the sphere gradually moves closer to the valve seat until it makes full contact at the closed position. When opening, the sphere immediately disengages from the sealing position, resulting in minimal friction torque during the opening process.
· The sealing surface can achieve self-cleaning. When the sphere leaves the valve seat, the medium can flush away any buildup on the sealing surface. For media that tend to crystallize easily, the sphere can remove these crystallizations during the closing process, achieving a reliable seal and avoiding the drawbacks of other valves that cannot be opened or closed.
· Low flow resistance Due to its straight-through design, fluid resistance is reduced, resulting in high efficiency and energy savings. The eccentric structure ensures that, when the valve is opened, the ball separates from the valve body, allowing for a straight-through flow path that prevents jamming or blockage.
· Long service life: The sphere and valve seat are built up with hard alloy that offers excellent corrosion resistance and wear resistance. The eccentric design of the sealing surface enables the spherical surface to automatically compensate for wear, thereby maintaining the valve’s tightness. The valve body material is identical to that of the pipeline, allowing direct welding without causing uneven stress or deformation even in the event of earthquakes or when vehicles pass over the ground. As a result, the valve boasts an exceptionally long service life—exceeding 30 years.
Product Technical Specifications
Nominal pressure
0.6MPa
1.0MPa
1.6MPa
2.5MPa
4.0MPa
Nominal diameter
50–1600 mm
50–1600 mm
50–1600 mm
50–1000 mm
50–400 mm
Sealing test
0.66MPa
1.1MPa
1.76MPa
2.75MPa
4.5MPa
Shell strength test
0.9MPa
1.5MPa
2.4MPa
3.75MPa
6.0MPa
Applicable temperature
-29 to 425℃
Applicable medium
Weakly corrosive fluids such as water, oil, steam, particulate slurries, ash and slag, and sewage.
Drive method
Handle, worm gear transmission, electric, pneumatic, hydraulic, and others
Material of main components
Part Name
Material Name
Material Code
Valve body
Cast steel
WCB
Valve disc
Cast steel overlay hard alloy
WCB-Cr-Mo-V alloy
Valve seat
Cast steel overlay hard alloy
WCB-Cr-Mo-V alloy
Valve stem
Stainless steel
2Cr13
PQ3(6, 7, 9)60H(R, M, Y, G) Type Welded Connection Double-Eccentric Hemisphere Valve—Outline and Connection Dimensions
Unit: mm
Nominal diameter L D H 360 Turbo Connection 660 pneumatic connection 760 Hydraulic Connection 960 electric connection DN HO phi H1 L1 H3 H2 L2 PN6-40 (0.6–4.0 MPa) 32 120 38 65 345 200 350 225 250 450 357 40 165 46 75 355 200 370 225 265 460 357 50 178 62 85 380 250 395 282 275 480 357 65 192 75 90 425 300 430 325 280 485 357 80 203 91 105 450 300 500 389 275 490 357 100 229 117 120 470 300 580 432 305 500 357 125 254 162 135 480 300 635 537 330 585 357 150 267 172 160 515 300 760 537 350 640 357 200 292 223 180 665 400 830 669 390 675 357 250 394 278 220 715 500 895 1162 500 760 555 300 419 329 240 850 400 940 1162 500 790 555 350 450 360 270 820 500 1025 1380 635 975 691 400 530 426 310 990 300 1090 1380 690 1025 735 450 580 500 325 970 300 1165 1860 825 1095 735 500 660 550 340 1040 300 1210 1860 685 1120 735 600 760 660 450 1095 300 1355 1860 765 1295 940 700 900 740 520 1245 400 1460 1860 780 1420 1070 800 1000 840 570 1355 400 1590 2350 837 1475 1070 900 1100 940 650 1470 600 1660 2350 895 1585 1070 1000 1200 1040 730 1470 600 1790 2350 955 1640 1070 1200 1300 1260 750 1750 600 1460 1695 1920 1400 1500 1460 860 1840 600 1770 1920
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No. 55, Jinjiangnan Road, Shangjie District, Zhengzhou City, Henan Province
Phone:+86-371-68122889
Email:zzsfmjt@126.com
Mobile phone:+86-13703990948
Fax:0371-68122899
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