Features of Eccentric Spherical Valve

The Eccentric Spherical Valve is a relatively new type of ball valve category, featuring advantages such as frictionless operation, low wear on the seal, and a small torque for opening and closing. This valve achieves its opening and closing function by rotating the ball around the centerline of the valve body.

Ideal for stringent cut-off conditions in oil, chemical, and urban water supply and drainage industries.

A variant of the eccentric hemisphere valve is the side-mounted eccentric hemisphere valve, which features a center axis of the valve body offset from the center axis of the hemisphere, with a sealing pair only set on one side of the valve body. This design results in minimal pressure loss and resistance to particle wear, making it particularly suitable for media containing solid particles. Another type is the top-mounted eccentric hemisphere valve, which, through the design of the eccentric valve body, eccentric ball, and valve seat, becomes increasingly tight during the closing process, achieving a perfect sealing effect. This valve is especially suitable for media such as steel, aluminum, fiber, fine solid particles, pulp, and fly ash.

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The structural features of the eccentric globe valve mainly include the following aspects:

The hemispherical design: The fluid passage of the eccentric hemispherical valve features a hemispherical design, with the valve disc centered in the valve body, allowing fluid to flow freely and reducing fluid resistance.

2. Double Eccentric Design: The eccentric ball valve features a double eccentric design, with both the disc and stem axis, as well as the stem and body axis, exhibiting a certain degree of offset. This enables the disc to achieve bidirectional unloading during opening and closing, thereby reducing the torque required for operation.

3. Adjustable Seat Ring: The seat ring of the eccentric hemisphere valve is adjustable, allowing for adjustments to the seat seal during use, ensuring the valve's sealing performance.

4. Valve Stem Sealing: The eccentric sphere valve features a sealed valve stem design, which effectively prevents the medium from leaking outside the valve stem, enhancing the valve's safety performance.

5. Bi-directional Sealing: The eccentric hemisphere valve employs a bi-directional sealing mechanism, with an elastic sealing pair for positive sealing and a metallic sealing pair for reverse sealing, to prevent medium leakage.

6. Self-cleaning Structure: As the sphere tilts to avoid the valve seat, the liquid in the pipeline uniformly distributes along the spherical crown at 360 degrees, thereby avoiding partial flushing of the valve seat by high-speed liquid and also washing away the accumulation on the crown, achieving the self-cleaning effect.

The characteristics of the eccentric hemisphere valve mainly include the following aspects:

1. Unique Structure: The eccentric hemispherical valve boasts a distinctive design, consisting of a sphere, an eccentric shaft, and a sealing pair. The surface of the sphere is hemispherical in shape, with the center of the sphere offset from the axis, hence the name "eccentric hemispherical valve." This design ensures smoother operation during the opening and closing of the valve.

2. Bidirectional Sealing: The eccentric hemisphere valve utilizes a bidirectional sealing mechanism, with an elastic sealing pair for positive sealing and a metallic sealing pair for reverse sealing, effectively preventing medium leakage.

3. Self-Cleaning Performance: The eccentric hemispherical valve boasts excellent self-cleaning capabilities. With a small contact area between the valve ball and seat, it experiences minimal friction and has great wear resistance, resulting in a long service life. It performs exceptionally well under special working conditions such as high viscosity and the presence of solid particles.

4. Easy Installation: The eccentric ball valve bodies are equipped with flanges, enabling connection to different grade pipeline flanges with ease and precise positioning.

5. Wide Application Range: Off-center spherical valves are suitable for medium control in industries such as chemicals, petrochemicals, and food, excelling particularly in special working conditions like high temperature and pressure, strong corrosion, high viscosity, and the presence of solid particles.

6. User-friendly Operation: The eccentric hemisphere valve offers easy operation, with quick opening and closing. It only requires a 90° rotation from fully open to fully closed, making it convenient for remote control.

7. Easy Maintenance: The eccentric ball valve has a simple structure, and the sealing rings are generally movable, making it convenient for disassembly and replacement.

8. Sealed Reliability: The sealing pair of the eccentric hemisphere valve employs dual metal materials, achieving a hard sealed metal spherical surface belt, fireproof and explosion-proof, with a tight seal.