Premium-grade hydraulic parts, low-friction guide strips, and heavy-duty hoses designed for extreme structural loads and underground support machinery.
Modern subterranean engineering requires heavy transport machinery that must work efficiently under extreme loads, high ambient temperatures, and corrosive environments. The structural integrity of hydraulic roof supports, heavy-duty utility vehicles, and excavation drilling equipment hinges directly on high-performance hydraulic seals and robust high-pressure hoses. Sub-standard components result in critical system leaks, machine downtime, and high replacement costs.
As global industries demand higher levels of performance, companies are transitioning from standard seals to customized tribological solutions. The selection of materials like Bronze-filled PTFE, NBR, POM, and custom Polyurethanes has become critical to minimizing friction, reducing stick-slip phenomena, and withstanding pressures of up to 400 bar and beyond.
By leveraging advanced material science, global OEMs can now secure long-term wear resistance, reducing maintenance intervals in heavy coal mining, TBM (Tunnel Boring Machine) tunneling, and civil engineering projects.
Shaanxi Kelong New Materials Technology Co., Ltd. was founded in 1996, growing from the respected Xianyang Kelong Rubber Products Institute. Over the last quarter-century, Kelong has evolved into a prominent technological innovation enterprise that integrates R&D, manufacturing, and sales.
Our core capabilities focus on heavy-duty hydraulic seal sets, high-pressure industrial rubber hoses, coal mine auxiliary transportation equipment, technological services, and localized support machinery repairs. Our advanced solutions are widely used in coal mining, civil aviation, high-speed rail networks, civil engineering machinery, wind power installations, and marine offshore drilling rigs.
Kelong is currently ranked in the top three of China's domestic coal machine sealing industry, with an 8% market share. Our production capacity for high-pressure rubber hoses and frame-type handling vehicles is projected to enter the domestic top three within two years.
Combining European engineering technology with intelligent, automated production to deliver resilient and cost-effective subterranean support solutions.
Our complete hydraulic sealing line is equipped with manufacturing technology from DMH Company in Austria. This setup enables quick design-to-production turnaround times, tight tolerance management, and the flexibility to produce custom seal profiles without expensive molds.
Our hydraulic hose production facility uses advanced machinery imported from Italy. These manufacturing systems ensure consistent wire braiding tension and vulcanization control, allowing our hoses to meet and exceed EN853 and SAE100 pressure standards.
| Performance Metric | Standard Industry Product | Kelong Engineered Standard | Operating Impact |
|---|---|---|---|
| Operating Pressure Limits | 250 Bar - 350 Bar | 400 Bar - 500 Bar (Upgraded Wire Braid) | Higher safety margins, reliable peak load containment. |
| Material Durability | Standard Polyurethane / NBR | Modified PTFE + Bronze, High-Density POM | Decreased stick-slip, longer component lifespans. |
| Thermal Resistance Range | -30°C to +90°C | -45°C to +120°C (Extended Polymer Bounds) | Reliable seal and hose operation in deep mining wells. |
| Precision Tolerance Control | ISO 3302-1 M2 Class | DMH Austrian Machine Precision (Within ±0.03mm) | Less dynamic friction, minimal oil leakage. |
Our engineering solutions are designed and tested to withstand high pressure, severe weather, and continuous cycle times.
Our ultra-tough, high-pressure hydraulic hoses deliver reliable power transmission to heavy machinery on active coal longwall faces.
Rigorously tested to prevent pressure spikes, our hydraulic systems keep dynamic outriggers stable on heavy mobile cranes.
Combining flexibility and high burst pressures, these specialty hoses resist saltwater corrosion and external wear.
High-reliability hoses that minimize fluid friction and support consistent pitch adjustment in remote locations.
Designed to seal tightly and last long under high pressures, reducing maintenance downtime and overall operational costs.
We maintain strict quality control throughout our manufacturing processes, supported by our ISO 9001 and IRIS (International Railway Industry Standard) certifications. Each batch is traced from raw material mixing to the final testing stage.
We reinvest over 7% of our annual revenue into R&D. With our dedicated research lab and a team of 180+ technicians, we continuously develop new polymer blends and robust seal profiles.
We serve companies in mining and industrial hubs worldwide. Our logistics support and robust manufacturing capabilities ensure reliable supply security and competitive pricing.
When engineering underground transportation systems, choosing the correct material for dynamic and static seals is critical. Subterranean machinery must operate under high shear forces, abrasions, and fluid exposure. Below, we break down the materials used in our sealing elements to help procurement managers make informed decisions.
Bronze-filled PTFE guide strips are the standard for heavy-load hydraulic cylinders. Pure PTFE provides low friction but lacks structural load capacity. Adding bronze particles improves wear resistance, thermal conductivity, and load resistance while maintaining the material's low friction coefficient. This combination helps prevent stick-slip issues during start-up.
NBR is highly resistant to petroleum-based oils, hydraulic fluids, and grease. In underground mining equipment, FDA-approved NBR provides reliable seal integrity in aqueous conditions. High-grade NBR is also used in wire-braided hoses to handle continuous pressure spikes without degradation.
For scraper seals and wiper rings, POM provides the rigidity needed to scrape off fine dust, coal particles, and grit. When combined with polyurethane (PU) elements, these seals prevent external contaminants from entering the hydraulic system, helping to protect internal cylinder parts.
Failure is typically caused by high pressure spikes, abrasive dust contamination, or chemical degradation from fluid exposure. Using bronze-filled PTFE guide strips and POM wipers helps protect the dynamic seal from particulate wear and prevents fluid blow-by.
Our hoses are engineered and tested to meet EN853 (European Standard) and SAE100 (Society of Automotive Engineers) requirements. Backed by our IRIS certification, our hoses undergo rigorous pressure cycle testing to ensure long-term durability in high-vibration applications.
Austrian DMH technology allows us to machine custom seal profiles directly from high-performance semi-finished billets. This process eliminates the time and cost of molding, enabling us to deliver precise custom seals for unique dimensions and emergency repair needs.
Yes. We manufacture FDA-compliant NBR and clean elastomer compounds. These materials are designed for environments with strict cleanliness requirements, such as food processing, civil aviation systems, or clean-water utility systems.
With over 600 million RMB in assets and an integrated factory setup, we manage the entire production process from compound mixing to extrusion and finishing. Our large manufacturing capacity helps insulate clients from supply chain disruptions, ensuring stable lead times and consistent product availability.
Explore our broader selection of high-pressure braided hoses, single/double acting seals, and custom wiper scraper rings.
Kelong New Materials
