Core Technology: Flange Structure Systems Engineered for Harsh Conditions

In challenging industrial environments such as oil & gas, seawater desalination, and chlor-alkali chemicals, pipeline leakage and delamination are fatal pain points. Leveraging decades of expertise, Guangdong Kejin New Materials Co., Ltd. has independently developed a revolutionary flange structure system specifically for ultra-large diameters (above DN2000mm) and high-pressure (1.0–4.0MPa) applications.

Our product portfolio features two primary series: Enhanced MC Nylon Pipe and Nylon-Steel Composite Pipe. Beyond their exceptional resistance to extreme temperatures (-36°C to 160°C) and highly corrosive media, these pipes solve the industry-wide issues of "leakage, loosening, and delamination" from the root through unique end-face and inner-groove physical structures.

Series I: Enhanced MC Nylon Straight Pipe — Flange Face Tooth/Groove Structure

For pure nylon pipeline connections, we have replaced traditional smooth-faced flanges with high-precision concave-convex tooth/groove designs on the end faces to achieve the core goals of "Leak Prevention, Anti-Loosening, and Extended Service Life".

Multi-layer Labyrinth Seal for Complete Leak Prevention: During bolt pre-tensioning, the soft gasket is fully embedded into the gaps of the flange face, forming multiple continuous physical barriers—equivalent to adding a multi-layer "labyrinth lock" to the pipeline. This completely blocks leakage paths for media like oil, gas, and water, compensates for nylon surface processing tolerances, and ensures an airtight seal.

Mechanical Limit to Prevent Gasket Displacement: The interlocking tooth/groove structure provides a physical mechanical limit for the gasket. In the face of pressure fluctuations, system vibration, or severe thermal expansion and contraction, it effectively prevents the gasket from sliding or being squeezed out, ensuring uniform force distribution. Simultaneously, the increased friction on the flange face offsets the risk of bolt loosening caused by nylon material creep, enhancing long-term connection stability.

Stress Distribution to Prolong Component Life: This structure evenly disperses concentrated stress across the flange face, preventing nylon flanges from cracking or deforming under high pressure and impact loads. This significantly enhances long-term operational stability and extends the service life of the fittings.

Optimized "Gentle Slope Tooth" Design for Large-Diameter & High-Pressure Scenarios

For ultra-large diameter pipelines, we specifically recommend our "Tooth Type" structure, which more easily meets high processing accuracy requirements. The roots of these gentle slope teeth are engineered to avoid stress concentration and can withstand greater bolt pre-tension, performing excellently in offsetting high-pressure media impact and material creep.

Series II: Nylon-Steel Composite Straight Pipe — Steel Flange Inner Groove Interlocking Structure

The ultimate challenge for composite pipes is material fusion. Our steel flanges utilize a specialized "Inner Groove Interlocking/Embedding" process, providing a triple guarantee of "Strength + Sealing + Anti-Delamination".

Physical Interlock to Eliminate Delamination and Peeling: During the molding process, the nylon material fills the grooves of the steel flange, forming a solid "Steel Claws Grabbing Nylon" mechanical interlocking structure after solidification. This greatly increases the interface peel strength, ensuring the pipeline remains a rigid whole under high pressure or bending, preventing the inner lining from separating or peeling.

Rigid Base for Strengthened Sealing Support: The grooved structure of the steel flange acts as a skeletal "framework," allowing the nylon sealing layer to interlock tightly with the steel body. This robust support prevents the nylon layer from local collapse or back-detachment under high pressure, ensuring that the compression force from the gasket is accurately transmitted to the steel flange.

Torque Transfer to Solve Breakage Pain Points: Pure nylon flanges are prone to cracking under high bolt torque. Through our groove interlocking design, we transfer all mechanical torque and tension to the high-strength steel flange. The nylon layer focuses solely on corrosion-resistant sealing, while the high-strength steel handles all mechanical loads, avoiding accidents caused by insufficient connection strength.

Elastic Buffering to Compensate for Thermal Expansion Differences: To address the differing thermal expansion coefficients of steel and nylon, the interlocking structure reserves minimal elastic buffering space. During severe temperature fluctuations, it effectively releases interface tension stress, preventing cracking or separation caused by thermal expansion and contraction.