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Shijiazhuang Jiukai Engine Valve Manufacture Co., Ltd. – Professional manufacturer of high-performance automotive intake and exhaust valves with advanced surface treatment and extended service life.
Explore ProductsShijiazhuang Jiukai Engine Valve Manufacture Co., Ltd. is a professional manufacturer specializing in the production of automobile and engine intake and exhaust valves. With years of experience in valve development, design, production, and service, we deliver reliable, high-performance components trusted by global partners.
Our advanced manufacturing capabilities include double metal friction welding, plasma welding, spiral polishing, hardening, nitriding, and laser surface treatment. We implement the German QPQ salt bath nitriding process to enhance surface strength, wear resistance, and anti-fatigue properties—significantly extending valve service life.
High-quality intake and exhaust valves engineered for durability, precision, and performance across a wide range of automotive and industrial applications.
High-performance exhaust valve with QPQ nitriding treatment for enhanced durability.
Precision intake valve with laser surface treatment and hardened rod end.
Heavy-duty valve for diesel engines with plasma welding technology.
Dual-material friction-welded valve for high-temperature applications.
Nitrided intake valve with branded plated shank for corrosion resistance.
Compact exhaust valve with spiral polishing for smooth operation.
High-strength valve for commercial vehicle engines with extended lifespan.
Balanced design valve with anti-fatigue properties for continuous use.
Lightweight intake valve optimized for fuel efficiency and performance.
Dual-exhaust configuration valve with enhanced thermal resistance.
Our production process integrates cutting-edge technologies to ensure unmatched quality, durability, and performance.
German soft QPQ process enhances surface strength, wear resistance, and anti-fatigue properties—extending valve life by up to 300%.
Combines high-temperature resistant head material with durable stem material for optimal performance under extreme conditions.
Precision machining with automated systems ensures consistent quality and tight tolerances across all production batches.
We use high-grade alloys including 21-4N, 4Cr9Si2, 4Cr10Si2Mo, and Inconel for valve heads and stems, selected based on application requirements.
Yes, we provide OEM and ODM services. Share your specifications and drawings, and we’ll develop a tailored solution.
QPQ (Quench-Polish-Quench) salt bath nitriding improves corrosion resistance, wear resistance, and fatigue strength without distortion.
Our products meet QC/T469-2002 standards. We maintain strict quality control throughout the production process.
Ready to discuss your valve requirements? Contact our team for product inquiries, samples, or technical support.
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