Yongjia Tong Ball Valve Co., Ltd.: Your Professional Stainless Steel 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 Stainless Steel Valve Seats
High heat resistance
Stainless steel maintains its structural integrity and sealing properties even under high combustion or operating temperatures, preventing warping and thermal fatigue.
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Exceptional durability
They resist wear, pitting, and cracking over long duty cycles, which helps extend service intervals and reduces overall maintenance needs.
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Corrosion resistance
The chromium content in stainless steel creates a passive oxide layer that resists rust and degradation from moisture, chemicals, and harsh environments.
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Cost-effectiveness
Compared to exotic materials like titanium or Stellite, stainless steel offers a highly reliable, budget-friendly alternative without sacrificing long-term reliability.
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High pressure capability
Stainless steel seats can withstand high-pressure conditions, making them ideal for rigorous chemical processing and oil and gas applications.
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Product Specifications
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904L Super Steel 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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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 Stainless Steel Valve Seats
Chemical processing & pharmaceuticals
Because of its excellent corrosion and pitting resistance, stainless steel (especially 316 grade) is the standard for handling aggressive chemicals and maintaining sterile conditions in sanitary pipelines.
Oil & gas / petrochemical
Used extensively in gate valves and ball valves to endure harsh upstream and midstream environments, high mechanical stress, and sour gas.
Water & wastewater treatment
Leveraged for long-term durability against water exposure and various treatment chemicals without rusting or degrading.
Food & beverage
Utilized in sanitary process valves where non-corrosive, non-contaminating, and cleanable metal surfaces are required.
Automotive & high-performance engines
Stainless steel valves and hardened valve seats are used to resist the high heat, lack of cushioning from unleaded fuels, and wear experienced in heavy-duty or racing engines.
Packaging and Shipping
Certifications
FAQ
With abundant machining experience, we are one of the most professional stainless steel valve seats manufacturers in China. We warmly welcome you to buy stainless steel valve seats at competitive price from our factory. If you have any enquiry about cooperation, please feel free to email us.
Metal seats, 2205 Super Duplex Steel Valve Seats, SS316L valve seats
