Eccentric Half Ball Valve

It is a hemispherical valve with an eccentric design, mainly used to shut off or regulate the medium in the pipeline (e.g., water, sewage, gas, sludge, etc.). Its main feature is that the valve core (hemisphere) and valve seat are eccentric in design to reduce wear and improve sealing. It is suitable for high-pressure, high-wear, or particulate working conditions.

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Product Details

1. Basic structure and working principle
(1) Design features
● Eccentric Design:

● Single eccentricity: The axis of the valve stem is offset from the center of the ball to reduce friction when opening and closing.

● Double eccentricity (commonly used): The axis of the valve stem is offset from the center of the ball and the center of the sealing surface to further reduce wear.

● Triple eccentricity (high performance): Based on double eccentricity, the slope of the valve seat is offset to achieve rigid metal sealing, which is suitable for high temperature and high pressure.

● Hemispherical valve core: Part-bore or full-bore design to reduce flow resistance and suitable for media containing impurities.

● Metal hard seal or soft seal:

● Metal seal (such as stainless steel carbide): resistant to high temperature, high pressure and wear, suitable for heavy-duty applications.

● Soft seal (such as PTFE, rubber): suitable for low temperature, low pressure and clean media.

(2) Working Principle
● Opening: The valve stem is rotated 90°, the hemisphere is separated from the valve seat, and the medium flows.

● Closure: The hemisphere is pressed against the valve seat, and the eccentric structure ensures that the sealing surface fits snugly, preventing leakage.

2. Main advantages
✅ Low Torque Operation: The eccentric design reduces friction and is easy to open and close.
✅ Wear resistance: suitable for media containing particles, fibers and sludge (e.g. wastewater and ore sludge).
✅ High tightness: Metal rigid seals can achieve zero leakage (ANSI VI class).

✅ Long service life: Reduces wear on the sealing surface and has low maintenance costs.

✅ Wide Application: Can withstand high temperature (≤600°C), high pressure (≤PN100/Class 600) and corrosive media.

3. Areas of application
● Wastewater treatment: municipal and industrial wastewater (including sludge and fibers).

● Power Industry: Desulfurization and Ash Removal Systems

● Petrochemicals: Transportation of particles and corrosive media.

● Metallurgical Mines: Slurry and fly ash pipelines.

● Paper industry: Purification of pulp and black liquor.