Eccentric Half-Ball Valve

Product Advantages

● Long Service Life: Eccentric design reduces seat wear and ensures consistent sealing.
● High Temperature and Pressure Resistance: Suitable for Class 150 / Class 300 / PN10–PN40 applications.
● Reliable Sealing: Metal or soft sealing provides dependable shut-off for various industrial fluids.
● Energy Efficient: Low torque design reduces actuator size and operation cost.
● Versatile Installation: Flanged or butt-welded ends available per EN or ASME standards.

Size Range

● NPS 1.5″ – 48″ / DN40 – DN1200

Pressure Rating

● Class 150 / Class 300 / PN10 / PN16 / PN25 / PN40

Optional Standards

● Design Standard: EN 593 / API 6D / ASME B16.34
● Test Standard: EN 12266 / API 598 / API 6D
● Flange Standard: EN 1092-2 / ASME B16.5 / ASME B16.47

Industry Applications

● Power generation and steam systems
● Petrochemical and refining plants
● Water treatment and slurry pipelines
● Metallurgy and pulp processing
● Environmental protection and desulfurization systems

1. What does the “eccentric” offset actually do during opening and closing?
The stem and ball center are offset from each other, so as the valve opens, the ball lifts away from the seat almost immediately instead of dragging across it — that’s what keeps operating torque low and prevents the seat from wearing down the way it would in a valve where the ball stays in constant contact.

2. Is this valve suitable for media with suspended solids or slurry?
Yes — the same eccentric lifting action that reduces torque also keeps sediment from packing against the seat during operation, which is why this design is commonly specified for slurry, pulp, and particulate-heavy lines where a standard floating ball valve would wear out faster.

3. Metal seat or soft seat — which should I specify?
A metal seat holds up better at high temperature and in abrasive or particulate media where a soft seat would erode quickly; a soft seat gives a tighter bubble-tight shutoff at lower pressure and temperature where erosion isn’t the primary concern. You can read our guide on soft seated vs. metal seated valves.

4. Does this valve work the same as a standard floating or trunnion ball valve?
Not quite — a floating ball relies on the ball itself pressing into the seat under line pressure, and a trunnion ball is fixed in place with the seat doing the sealing work; the eccentric design’s main difference is that the ball physically separates from the seat during rotation, which is what gives it the lower-wear, self-cleaning behavior standard ball valves don’t have.

5. Can this valve be automated, or is it manual-only?
Both — the same body accepts a manual gear operator with handwheel, or a pneumatic or electric actuator for remote and automated control, so the choice comes down to torque requirements and whether the application needs local or automated operation.