Yongjia Tong Ball Valve Co., Ltd.: Your Professional 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.
Integrated valve seats
Machined directly into the cylinder head or engine block, these seats are part of the original casting or forging.
Powder metal valve seats
Manufactured using advanced powder metallurgy, these seats are formed by compressing high-alloy metal powders under extreme pressure and heat.
Insert valve seats
Pressed or shrink-fitted into pre-machined bores in the cylinder head, insert seats are commonly used in performance and aftermarket applications.
Chromium carbide valve seats
Chromium carbide valve seats are engineered for high-performance and heavy-duty applications where extreme heat resistance and wear durability are critical. These seats are typically larger and feature a more defined seating area compared to standard materials.
Standard and specialty alloy valve seats
Beyond chromium carbide, valve seats are commonly made from materials such as stellite, nickel-based alloys, and hardened tool steels. The choice depends on engine specifications, including compression ratio, fuel type, and expected operating temperature.
Product Specifications
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Globe 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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seats concentricity |
≤ 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 Valve Seats
Automotive industry
Internal combustion engines rely on precisely engineered valve seats to maintain compression, regulate airflow, and withstand continuous thermal cycling. Modern engines demand materials that resist wear, corrosion, and deformation under high operating temperatures.
Aerospace industry
In aviation and aerospace propulsion systems, valve seats must perform flawlessly under extreme altitudes, rapid temperature shifts, and high vibration environments. Only manufacturers with AS9100 certification and NADCAP approval are qualified to supply this sector.
Oil & gas industry
Valve seats in upstream, midstream, and downstream operations face aggressive media including sour gas (H₂S), high-pressure steam, and abrasive slurries. Hardfaced HV (hardened valve) seats are widely used for their resilience.
Marine industry
Marine engines and auxiliary systems operate in corrosive saltwater environments, requiring valve seats made from materials that resist pitting, crevice corrosion, and biofouling.
Hydraulic & industrial systems
Hydraulic machinery in manufacturing, construction, and automation depends on reliable valve seats to control fluid power with precision. These components must endure constant pressure fluctuations and rapid actuation cycles.
Revamping & legacy systems
Many industries—including mining, power generation, and rail—operate aging equipment where original parts are obsolete. Specialized manufacturers play a vital role in reverse-engineering and reproducing valve seats from worn samples or legacy blueprints.
Packaging and Shipping
Certifications
FAQ
With abundant machining experience, we are one of the most professional valve seats manufacturers in China. We warmly welcome you to buy valve seats at competitive price from our factory. If you have any enquiry about cooperation, please feel free to email us.
