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Eccentric Hemispherical Valve

Eccentric Hemispherical Valve

Structure and Principle

• The valve core is hemispherical, with its rotation center eccentric to the valve body center.

• When open: The hemisphere disengages from the valve seat, resulting in no friction and low torque.

• When closed: The hemisphere presses against the valve seat, forming a line/surface seal.

• Typical structures: Side-mounted/Top-mounted, eccentric shaft, eccentric hemisphere.
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Product Description

Key Features

1. Excellent Sealing Performance: Hard seals achieve zero leakage, while soft seals provide even tighter sealing.

2. Wear-Free and Long Service Life: Opening and closing does not scrape the valve seat, making it more wear-resistant than ordinary ball valves.

3. Anti-Stuck and Self-Cleaning: The hemispherical rotation has a scraping effect, preventing mud, dust, and slurry from causing blockages.

4. Low Flow Resistance and Smooth Flow: The near-straight-through flow path reduces pressure drop, making it suitable for high flow rates.

5. Easy On/Off: The eccentric structure significantly reduces operating torque, suitable for both pneumatic and electric operation.

 

Common Parameters

• Nominal Diameter: DN25～DN1400

• Pressure Rating: PN10/PN16/PN25, Class150

• Temperature Range:

◦ Soft Seal: -20℃～180℃

◦ Hard Seal: Up to approximately 450℃

• Valve Body Material: Cast Steel WCB, Stainless Steel 304/316, Ductile Iron

• Sealing Material: Hard Alloy, Stainless Steel Welding, PTFE, etc.

 

Applicable Operating Conditions

• Wastewater treatment, mud, slurry, slag-water mixtures

• Fly ash, dust, flue gas, coal gas

• Chemical slurry, papermaking black liquor, particulate media

• Urban heating, water supply and drainage, circulating water systems

• Cut-off control requiring wear resistance, anti-clogging, and long service life

 

Applicable Industries


Municipal water supply and drainage, wastewater treatment, metallurgy and mining, power generation, fly ash, petrochemicals, papermaking, coal, cogeneration, etc.

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• V-shaped ball core: The hemispherical valve core has a V-shaped notch, which is the core component for regulation and shearing.

• Valve seat: It mates with the V-shaped notch to form a sealing surface. Soft seals (TFM, etc.) are suitable for clean media, while hard seals (welded or sprayed hard alloy) can be used in high-temperature, high-pressure, highly corrosive, or particulate-containing conditions.

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• Regulation Function: As the valve core rotates, the overlap area between the V-shaped notch and the valve seat continuously changes, creating an equal percentage flow characteristic (opening degree and flow rate are logarithmically related), achieving high-precision control within the 30%-70% opening range.

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