Oil Resistant Vulcanized Rubber Joint

The oil resistant vulcanized rubber joint is an oil-resistant flexible connection accessory molded using an oil-resistant nitrile rubber (NBR) main body combined with an integral high-temperature molding and vulcanization process, specifically developed for oil medium conveying pipelines such as lubricating oil, hydraulic oil, fuel oil, and oily sewage. Ordinary EPDM rubber joints experience swelling, softening, elasticity attenuation, and sealing failure after long-term contact with oil products, with service life greatly shortened. The rubber main body of the oil resistant vulcanized rubber joint adopts a high-quality nitrile rubber formula, with acrylonitrile content optimized and adjusted, featuring excellent resistance to mineral oil, fuel oil, and grease. After long-term contact with oil products, it does not swell or soften, with high elasticity retention. Combined with the dense cross-linked structure brought by the integral vulcanization process, the product's service life and sealing reliability under oil medium working conditions far exceed those of ordinary rubber joints. The product adopts a single-sphere one-piece molding and vulcanization, with the oil-resistant rubber matrix uniformly wrapped by internal multi-layer high-strength nylon cord, capable of simultaneously absorbing three types of pipeline displacement: axial expansion and contraction, lateral offset, and angular deflection, isolating vibration noise generated by oil pumps and valves operation, and avoiding the probability of leakage at oil pipeline interfaces caused by repeated stress pulling from the source.

Our factory has over 20 years of R&D and manufacturing experience in oil-resistant rubber joints. We have continuously iterated and optimized the nitrile rubber formula and vulcanization process for oil resistant vulcanized rubber joints. The rubber compound acrylonitrile content, vulcanization system, and oil-resistant additive ratio have all undergone strict verification, ensuring the product achieves the best balance between oil resistance and physical and mechanical properties in various oil media. The product nominal diameter covers DN25-DN600, with working pressure PN6-PN16, meeting the operational needs of the vast majority of oil medium pipelines. The rubber main body adopts high-quality NBR oil-resistant rubber compound. Flanges are fully compatible with the four major international standards of DIN, ANSI, GB, and JIS, with flange materials available in multiple grades including anti-corrosion carbon steel, SS304, and SS316. For oil working conditions, stainless steel flanges are preferably recommended to avoid flange rusting contaminating oil products. For overseas lubricating oil equipment manufacturers, hydraulic system integrators, fuel pipeline engineering contractors, and distributors, we support customization of special nominal diameters, lengths, and oil resistance grades according to project drawings, and can provide oil resistance performance test reports and material certificates with the goods. Currently, oil resistant vulcanized rubber joints have been applied in batches to lubricating oil conveying pipelines, hydraulic station oil systems, fuel boiler room oil supply pipelines, oily sewage treatment systems, machine tool hydraulic circuits, ship engine room oil circuits, and other projects. Products are exported to over 80 countries and regions worldwide, and with excellent oil resistance and high reliability of the integral vulcanization process, they have become designated oil-resistant flexible joints for numerous overseas oil equipment manufacturers and engineering contractors.

The product is widely used in lubricating oil conveying pipelines, hydraulic station oil systems, fuel boiler room oil supply pipelines, oily sewage treatment systems, machine tool hydraulic circuits, ship engine room oil circuits, compressor lubricating oil pipelines, gearbox oil circuit connections, and other oil medium conveying scenarios. It is an ideal oil-resistant flexible connection accessory for oil pumps, hydraulic valves, and oil tank inlet and outlet pipelines.

We have established special quality control standards for oil-resistant vulcanized products. At the raw material stage, we conduct special oil resistance performance testing on NBR nitrile rubber compounds, including core indicators such as volume change rate, hardness change, and tensile strength retention rate after oil immersion, to confirm oil resistance performance meets standards. Flange blanks undergo material re-inspection. During production, we focus on controlling vulcanization temperature, pressure, and pressure-holding duration to ensure sufficient cross-linking of oil-resistant rubber molecules, with self-inspection and mutual inspection performed at each process to eliminate defects such as under-vulcanization, delamination, and bubbles. At the finished product stage, 100% undergo 1.5 times working pressure water pressure testing, with oil-resistant batches additionally undergoing oil immersion accelerated aging testing, simulating long-term oil contact conditions to verify product oil-resistant service life, and test records retained for archiving and reference. The factory is equipped with professional testing equipment such as pressure testing machines, universal tensile testing machines, oil immersion testing devices, and thermal aging test chambers, supporting third-party on-site inspection and also able to provide a full set of quality documents such as oil resistance test reports and material certificates with the goods.

The full series of oil resistant vulcanized rubber joints possess complete international compliance qualifications. The production system has passed dual certification of GB/T19001-2016/ISO9001 Quality Management System and GB/T45001-2020/ISO45001 Occupational Health and Safety Management System. The products have obtained CE and RoHS compliance licenses, along with supporting material MTC certificates, oil resistance test reports, and certificate of origin (CO). All qualification documents can be provided in electronic version in advance for overseas oil equipment project bidding, or can be sent in paper form with the goods. Complete compliance qualifications can help distributors smoothly undertake lubricating oil, hydraulic, and fuel industrial project orders, avoiding bid loss and customs clearance obstruction caused by missing qualifications.

A dedicated cross-border after-sales team is available 7×24 hours for online Q&A. The product comes with a unified 24-month warranty. During the warranty period, quality issues such as oil leakage, rubber layer swelling and cracking, and interface delamination caused by non-human external forces will be replaced with brand new products free of charge. Before sales, we can issue exclusive oil-resistant selection solutions and installation diagrams for oil medium type, temperature, and pressure working conditions. During the order production stage, we regularly push real-time photos and videos of oil-resistant rubber compound mixing, vulcanization molding, and finished products to synchronize production progress. After the goods are shipped, we synchronize bills of lading and packing lists, and follow up on ocean shipping logistics status throughout the process. For long-term stable cooperating oil equipment manufacturers and engineering contractors, we offer value-added services such as priority production scheduling channels, one-on-one technical specialist remote guidance, and priority trial sales of new products, comprehensively assisting customers in developing the oil-resistant pipeline supporting market.

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