About Us

YAJIN VALVE GROUP , Ltd. was established in 2011 in Wenzhou, China - the "Valve & Pump Capital of China." We specialize in valve solutions for extreme service conditions, integrating R&D, precision manufacturing, and global sales. Our 2,000 m² modern facility is equipped with CNC machining centers, advanced material analysis instruments, and a certified high-pressure valve test center, with an annual capacity of 3,000 sets.

Beyond standard valves, YAJIN is a professional manufacturer of Ceramic Valves and Wear-resistant, Corrosion-resistant, High-temperature Valves. Our core product lines include Ceramic Ball Valves, Ceramic Double Gate Valves, Ceramic Feed Valves, Abrasion-resistant Ash Slurry Valves, Fluorine-lined Corrosion-resistant Valves, and High-Temperature/High-Pressure Power Plant Valves. All products are designed and manufactured in strict compliance with API, ANSI, DIN, JIS, and GB standards. Certified with ISO 9001, CE, API 6D, and TS, our valves are widely deployed in highly abrasive and corrosive applications such as Thermal Power, Mining, Metallurgy, Chemical Processing, Polysilicon, and LNG projects worldwide.

Modern Manufacturing Facility for Severe Service Valves
Located in Oubei, Wenzhou, Zhejiang Province, YAJIN VALVE GROUP operates a 3,950 m² manufacturing base. Unlike standard valve workshops, YAJIN specializes in producing valves for high-abrasion, severe-corrosion, and ultra-high-temperature applications. We have established a comprehensive system for special processing and rigorous quality control.

 

Precision Machining Workshop
Our facility is equipped with multiple high-precision CNC lathes and machining centers, ensuring tight tolerances for valve bodies, bonnets, and flanged connections. To meet the specific requirements of Ceramic Valves, we maintain a dedicated Ceramic Component Grinding & Assembly Zone with constant temperature control, guaranteeing perfect fitting between ceramic internals and metal housings.

Special Welding & Heat Treatment
For High-Temperature Valves and Corrosion-Resistant Alloy Valves, our workshop is equipped with advanced overlay welding (surfacing) equipment and heat treatment furnaces. We perform Stellite hardfacing to create high-hardness, wear-resistant layers on seats and sealing surfaces. Combined with stress-relief annealing and solution treatment processed in our furnaces, we ensure the structural integrity and long-term stability of valves under extreme pressure and temperature conditions.

 

Certified Valve Test Center
Quality is the foundation of YAJIN. We operate an independent Valve Comprehensive Test Center capable of conducting Shell Tests, High-Pressure Seat Tests, and Low-Pressure Pneumatic Tests in accordance with API 598 and ISO 5208 standards. Furthermore, for Ceramic and Wear-Resistant valves, we employ Cycle Life Test Benches to simulate real-world operating conditions, verifying zero leakage and extended service life before delivery.
From raw material receiving to final packaging, every YAJIN valve undergoes strict traceability procedures, ensuring that every product delivered to our global clients is reliable and built to last.

YAJIN VALVE GROUP specializes in solving abrasion, corrosion, and high-temperature challenges in industrial pipeline systems. Our core product series include:

YAJIN VALVE GROUP provides fluid control solutions engineered for extreme conditions. Leveraging our expertise in wear-resistance, corrosion-resistance, and high-temperature engineering, our valves are trusted across the following critical industries:

Lithium Battery & New Energy

Cathode Material Production (LFP / NCM):In the calcination, grinding, and conveying of lithium ore and precursors, the dust is highly abrasive. YAJIN Ceramic Ball Valves and Wear-Resistant Butterfly Valves effectively resist material erosion, eliminating leakage and dust emissions.

Anode Material Production (Graphitization):Supporting high-temperature graphitization furnaces, our High-Temperature Valves ensure stable operation in processes ranging from 800°C to 3,000°C.

Electrolyte Preparation & Handling:Electrolytes like LiPF₆are highly hygroscopic and corrosive. We supply Fluorine-Lined Valves and Full Stainless Steel Valves to guarantee safety in electrolyte storage and dosing lines.

Lithium Battery Recycling (Black Mass Processing):Acid leaching processes (sulfuric/hydrochloric acid) and black mass slurry handling demand extreme acid-resistance and wear-resistance. YAJIN provides one-stop valve solutions for this rapidly growing sector.

 

Power & Energy

Thermal & Nuclear Power: Used in main steam systems, drain systems, and boiler blow-down. Our High-Temperature Valves withstand extreme pressure and heat, while Ceramic Feed Valves and Double Gate Valves are specifically designed for abrasive fly ash handling in dust removal systems.

LNG & Oil Storage: Corrosion-Resistant Valves and Cryogenic Ball Valves serve the extraction, transportation, and storage of liquefied natural gas, petroleum, and natural gas.

Chemical & Petrochemical

Acid & Alkali Handling: For highly corrosive media such as sulfuric acid, hydrochloric acid, and caustic soda, we supply Fluorine-Lined Valves and Hastelloy/Monel Alloy Valves to ensure zero-leakage performance.

Refining & Cracking: In FCC and hydrocracking units, our High-Temperature Alloy Steel Valves provide safety and reliability under thermal stress.

 

Mining & Metallurgy

Slurry Transport: Facing highly abrasive slurries and tailings, our Ceramic Ball Valves​ and Wear-Resistant Plug Valves offer exceptional erosion resistance, significantly reducing downtime and maintenance costs.

Steel & Iron Smelting: Applied in pulverized coal injection (PCI), dust removal, and hot blast systems, our High-Temp Butterfly Valves and Abrasive Dust Valves perform reliably in harsh environments.

 

Polysilicon & Photovoltaic

Silicon Powder Handling: Silicon powder is extremely hard and prone to leakage. YAJIN Ceramic Valves provide superior sealing and wear resistance, making them critical components in polysilicon production.

 

Water Treatment & Environmental

Desalination: Duplex Stainless Steel Valves and Chloride-resistant Valves are utilized in RO systems and seawater pipelines.

Waste Incineration: We provide specialized valves for Flue Gas Desulfurization (FGD) systems, resisting both high temperatures and corrosive agents.

Yajin Valve Group is committed to excellence in product quality, workplace safety, and environmental responsibility. Our integrated management systems and manufacturing capabilities are certified by national authorities, while our R&D achievements are protected by multiple granted patents in wear-resistant ceramic valve technology.

 Management System & Manufacturing Certifications

ISO 9001:2015 Quality Management System​

Ensures consistent quality control from raw material incoming inspection through final pressure testing and packaging.

ISO 14001:2015 Environmental Management System​

Demonstrates our commitment to minimizing environmental impact and complying with relevant environmental laws and regulations.

ISO 45001:2018 Occupational Health & Safety Management System​

Validates our systematic approach to identifying workplace hazards, reducing operational risks, and safeguarding employee health and safety.

Special Equipment Manufacturing License (TS)​

Authorized by the State Administration for Market Regulation (SAMR) for the design and manufacture of pressure piping components (valves) in compliance with Chinese pressure equipment regulations.

Third-party inspection reports (SGS, TÜV, BV, etc.) are available upon request to support project tenders and client audits.

 Patents & R&D Achievements

Yajin Valve focuses on solving abrasion and corrosion challenges in harsh media through proprietary ceramic valve designs. We currently hold multiple granted utility model patents, including:

Wear-Resistant Ceramic Ball Valve – Enhanced sealing structure for extended service life in abrasive slurries and fly ash applications.

High-Performance Dome Valve (Round Gate Valve)​ – Patented design for dense-phase pneumatic conveying systems in power plant ash handling.

Anti-Crystallization Discharge Valve– Specialized for chemical processes involving crystallization-prone media.

Ceramic Hard-Seal Knife Gate Valve & Pneumatic Ceramic Double-Disc Gate Valve​ – Reinforced ceramic lining technology for mining and mineral processing lines.

Our R&D team continuously optimizes ceramic material formulations, surface treatment processes, and valve structures to meet evolving demands from the lithium battery, petrochemical, power generation, and metallurgical industries.

Yajin Valve Group operates a modern in-house manufacturing facility equipped with advanced CNC machining centers, precision testing equipment, and complete surface treatment lines. From raw material to finished valve, every critical process is controlled under our ISO 9001 quality management system to ensure dimensional accuracy, pressure integrity, and long-term reliability.

CNC Machining Centers & CNC Lathes​

Multi-axis CNC vertical/horizontal machining centers and CNC lathes deliver tight tolerances on critical components such as valve bodies, bonnets, discs, and stems-ensuring consistent sealing performance.

 

Large-Diameter Vertical Lathes (VTL) & Deep-Hole Drilling Machines​

Capable of machining large-bore valves up to DN1000 / DN1200, meeting the requirements of oil & gas, power plant, and water treatment projects.

 

CNC Machining Centers & CNC Lathes​

Multi-axis CNC vertical/horizontal machining centers and CNC lathes deliver tight tolerances on critical components such as valve bodies, bonnets, discs, and stems-ensuring consistent sealing performance.

Large-Diameter Vertical Lathes (VTL) & Deep-Hole Drilling Machines​

Capable of machining large-bore valves up to DN1000 / DN1200, meeting the requirements of oil & gas, power plant, and water treatment projects.

 

Automatic Shot Blasting & Sandblasting Equipment​

Provides uniform surface preparation prior to coating, significantly improving coating adhesion and corrosion resistance for ceramic-lined and metal-seated valves.

 

Heat Treatment Furnaces​

Programmable normalizing, quenching, and tempering furnaces optimize the mechanical properties of cast and forged materials per project specifications.

Valve Pressure Test Benches (Hydrostatic & Pneumatic)​

API 598/ ISO 5208compliant hydrostatic shell test benches and pneumatic seat leakage test benches verify pressure integrity and zero-leakage performance before shipment.

 

Material Analysis & NDT Equipment​

Includes direct-reading spectrometer (PMI), ultrasonic thickness gauge, hardness tester, and Non-Destructive Testing capabilities (Magnetic Particle Testing / Dye Penetrant Testing) for full material traceability.

 

Automated Painting & Baking Line​

Environmentally friendly spray-painting and baking line ensures uniform coating thickness and meets anti-corrosion requirements for harsh service conditions.

 

Quality Assurance in Manufacturing

All equipment is maintained under a strict Preventive Maintenance (PM) program. In-process inspection, first-article approval, and final 100% pressure testing are carried out by trained QC personnel. Every shipment is supported by Mill Test Reports (MTR), Inspection & Test Plan (ITP), and Certificate of Conformity.

Yajin Valve proudly serves the lithium battery, oil & gas, petrochemical, power generation, and water treatment industries worldwide with reliable, precision-engineered valve solutions.

Since 2011, Yajin Valve Group has built a strong presence both in the Chinese domestic market and across international borders. Our wear-resistant ceramic valves, high-temperature & high-pressure ball valves, and lined valves are trusted by EPC contractors, distributors, and end users in more than 30 countries and regions.

Export Markets & Regions

Southeast Asia: Thailand, Vietnam, Indonesia, Malaysia, Philippines, Singapore

Middle East & Central Asia: UAE, Saudi Arabia, Iran, Kazakhstan, Uzbekistan

Europe: Russia, Turkey, Poland, Italy, Germany (via agents/distributors)

Americas: Brazil, Chile, Peru (South America); USA, Canada (North America – via partners)

Africa & Others: South Africa, Egypt, Australia

Products are exported in compliance with major international standards including API, ANSI, DIN, JIS, and GB.

Proven Performance & Project References

Yajin Valve products have been successfully supplied to key industrial sectors worldwide:

New Energy / Lithium Battery Industry​ – Ceramic ball valves and ceramic knife gate valves installed in lithium carbonate/delithiation process lines for domestic and overseas lithium material plants.

Power Generation – Wear-resistant ceramic valves widely used in fly ash, desulfurization (FGD), and bottom ash systems in coal-fired and biomass power plants.

Petrochemical & Chemical – Corrosion-resistant lined valves and ceramic valves serving acid/alkali media handling in chemical processing plants.

Metallurgy & Mining – High-abrasion ceramic slurry valves and double-disc gate valves applied in iron & steel mills and mineral processing lines.

Pulp & Paper / Cement – Abrasive media handling valves for pulp stock and raw meal conveying systems.

With hundreds of completed project references and long-term partnerships with regional distributors, Yajin Valve continues to expand its global footprint-delivering reliable fluid control solutions backed by responsive technical support and on-time delivery.

 Pre-Sales Service – Expert Consultation & Engineering Support

At Yajin Valve, we view every inquiry as the start of a long-term partnership. Our pre-sales team helps you reduce project risk and cost before an order is even placed.

Application-Based Valve Selection​

Our experienced engineers analyze your operating conditions-including medium, temperature, pressure, flow rate, and end connections-to recommend the most suitable valve type and material.

Technical Documentation​

We supply comprehensive data sheets, P&IDs support, 2D drawings, and 3D models to streamline your design and approval process.

Custom OEM & ODM Solutions​

From non-standard dimensions to special actuators, we deliver tailor-made solutions that align with your project specifications and budget.

Standards Compliance & Certification​

All products are designed and manufactured in accordance with API, ANSI, DIN, JIS, and GB standards. Relevant certificates are available upon request to support tender submissions.

 In-Sales Service – Quality Assurance & Transparent Production

We believe transparency builds trust. Throughout the manufacturing cycle, we keep you informed and in control.

Dedicated Order Management​

A single point of contact oversees your order from confirmation to shipment, providing regular production updates, photos, and milestone reports.

Rigorous Quality Control​

Every valve is tested under our strict ISO-certified quality management system. Shell and seat leakage tests are conducted according to the approved Inspection & Test Plan (ITP), with full material traceability.

Third-Party Inspection Welcomed​

We fully support inspections by international agencies such as SGS, TÜV, BV, and Lloyd's Register.

Export-Standard Packaging & Documentation​

Valves are packed in export-grade plywood cases with anti-rust and shock-proof protection. Each shipment includes a Mill Test Report (MTR), Certificate of Conformity, Operation Manual, and complete shipping documents.

 After-Sales Service – Reliable Support & Lifecycle Care

Our responsibility does not end at delivery. We ensure your valves perform reliably throughout their service life.

Warranty Commitment​

We offer a 12 month warranty from the date of shipment or commissioning. Any product proven defective will be repaired or replaced promptly at no extra cost.

Installation & Commissioning Guidance​

Detailed O&M manuals are provided with every order. For critical projects, our engineers are available for remote technical support​ or on-site supervision.

Spare Parts & Maintenance​

We maintain a long-term inventory of genuine spare parts and provide preventive maintenance recommendations to extend valve service life.

Rapid Response​

We acknowledge all after-sales inquiries within 24 hours​ and propose clear solutions without delay.