Yongjia Tong Ball Valve Co., Ltd.: Your Professional Overlaid Valve Seats Manufacturer!
Founded in 2009, Tong Ball Valve Co., Ltd. is a national high-tech enterprise specializing in precision valve balls for severe service applications. We provide reliable solutions for global industrial valve manufacturers through advanced material processing, precision machining, and surface coating technologies. With strict quality control and full production traceability, our products are widely used in oil & gas, petrochemical, power generation, and other demanding industries worldwide.
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Why choose us?
Advanced materials & surface engineering
We specialize in difficult-to-machine materials including duplex stainless steel, titanium, Inconel, zirconium, and engineering ceramics. Combined with HVOF, plasma spray, DLC/TiN coating, and laser cladding technologies, our valve balls deliver excellent wear resistance, corrosion resistance, and long-term sealing performance.
Experienced technical support & global supply
Supported by a technical team with over 30 years of industry experience, we offer customized valve ball solutions based on different application requirements. As an authorized supplier for global companies including Emerson and Flowserve, our products have been exported to more than 20 countries and regions
Precision manufacturing for severe service
Our machining accuracy reaches roundness ≤0.001 mm, supporting stable sealing performance under high pressure, high temperature, and corrosive working conditions. Products are validated through rigorous cycle testing to ensure durability and operational reliability.
Strict quality control & full traceability
From raw material inspection to final testing, every production process follows strict quality standards. We provide 100% inspection and complete production traceability, helping customers reduce quality risks and improve supply chain confidence.
Benefits of Overlaid Valve Seats
Superior corrosion resistance
The overlay protects the valve from aggressive media, including sour gas, chlorides, and acids, which is essential for oil, gas, and chemical processing.
Enhanced wear & impact resistance
Overlays significantly improve resistance to abrasion and erosion, especially in high-cycle or abrasive slurry applications.
Increased equipment lifespan
Adding a weld overlay can extend the service life of a valve by 30% to 300% compared to untreated components.
Simplified maintenance
Worn seats can often be rebuilt with a new overlay rather than replacing the entire valve, reducing both downtime and inventory costs.
Better thermal performance
Modern application methods like laser cladding reduce the heat-affected zone, maintaining the structural integrity of the base metal while providing a high-quality sealing surface.
Reliable sealing integrity
The process ensures a consistent, high-hardness sealing face that maintains its seal even through extreme pressure and temperature changes.
Product Specifications
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Colmonoy Overlaid Valve Seats |
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Size Range |
1/2" to 56" (Custom sizes available) |
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Pressure Rating |
PN10-PN420 (Class150-2500) |
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Body Material |
A105, A350 LF2, A182 F304, A182 F316, A182 F321, A182 F51, A182 F53, A182 F55, A182 F60, A182 F44, A564 630 (17-4PH) |
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Core Process/Coating |
ENP,HCR,STL6, STL12, STL20,Cr3C2, WC-Co, WC-Cr3C2-Ni, TiC-NiMo, SiC, CrC,ZrO2, Al2O3, Cr2O3, ZnO, TiO, Al2O3-TiO2,STL1, STL6, STL12,Ni60, Ni55, Ni45 etc. |
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Operating Temperature Range |
≤1200°C |
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Parameter Category |
Core Technical Parameters |
Standards for Determining Advanced Technological Level |
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Machining Seat accuracy |
≤ 0.025 mm |
≤ 0.005 mm (Ultra-High Precision) |
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Processing Seat Roundness |
≤ 0.025 mm |
≤ 0.011 mm (Micron-Level ) |
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Seatsconcentricity |
≤ 0.025 mm |
≤ 0.005 mm (Ultra-High Precision) |
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Other supplements |
≤ 0.4 μm |
≤ 0.1 μm (Mirror-Level) |
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Parameter Category |
Core Technical Parameters |
Criteria for High-End Technical Level |
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Coating Thickness Control |
Thickness Uniformity |
Thickness deviation at any spherical position ≤±8% (stricter than the general ±10% standard) |
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Thickness Tolerance Range |
100 - 300 μm (common range for wear-resistant layers); special ranges can be noted. No missed spraying for ultra-thin coatings (<10μm) |
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Coating Adhesion Performance |
Surface Hardness |
HV 1300+ |
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Bond StrengthBond Strength |
≥80 MPa |
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Interface PorosityInterface Porosity |
<0.5% |
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Coating Surface Quality |
Surface Roughness (Ra) |
≤0.2 µm |
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Spraying Accuracy (Positioning & Coverage) |
Spraying Positioning Accuracy |
±0.1mm |
Application of Overlaid Valve Seats
01
Oil, gas, and petrochemical processing
Valves in process-critical environments handle aggressive media such as sour gas, abrasive slurries, and high-pressure steam.
02
Internal combustion engines
Exhaust valves in heavy-duty diesel engines, natural gas engines, and high-performance applications endure intense heat and friction.
03
Nuclear power
In nuclear steam supply systems, valves must maintain "zero-leak" standards to prevent radiation spread and minimize maintenance.
Packaging and Shipping
Certifications
FAQ
With abundant machining experience, we are one of the most professional overlaid valve seats manufacturers in China. We warmly welcome you to buy overlaid valve seats at competitive price from our factory. If you have any enquiry about cooperation, please feel free to email us.
Industrial valve seats, Welded Stellite Seat, Welded Inconel overlaid valve seats
