TongBall's lock hopper valve balls are specifically engineered for the most severe service conditions found in gasification and high-pressure solids-handling applications. Available in sizes up to 56 inches, these balls feature heavy-duty wear-resistant coatings such as WC-CoCr, Cr₃C₂-NiCr, or ceramic composite layers, applied via HVOF or plasma spray technology, achieving surface hardness exceeding HRC 70 while maintaining exceptional toughness. The advanced coating system provides superior resistance to erosion, abrasion, and corrosion caused by high-velocity solids-laden media and elevated temperatures. Designed for lock hopper systems, coal gasification plants, and other solids-handling processes, our balls ensure long-term reliable operation with minimal downtime.
| Size Range | 1/2" to 56" (Custom sizes available) |
| Pressure Rating | PN10-PN420 (Class150-2500) |
| Base Material | Stainless Steel (304, 316, F51/F53), Alloy Steel, Inconel 625/718, Hastelloy C-276 |
| Coating Material | WC-CoCr, WC-10Co4Cr, Cr₃C₂-NiCr, Al₂O₃-TiO₂, Cr₂O₃ |
| Coating Process | HVOF / HVAF / Plasma Spray |
| Operating Temperature | ≤900°C (depending on coating) |
| Coating Hardness | HRC 65-75 / HV 1200-1600 |
| Bond Strength | ≥70 MPa |
| Surface Roughness (Ra) | ≤0.4 μm (as-ground) / ≤0.2 μm (polished) |
| Porosity | <1% |
| Roundness Accuracy | ≤0.02 mm |
| Coating Thickness | 100 - 500 μm (customizable) |
