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The sealing principle of the GT type interface of GT type ductile iron pipe is similar to that of the T type interface. As the internal pressure of the pipeline increases, the tighter the contact surface between the rubber ring sealing sleeve and the socket, the better the sealing effect.

The internal anti-corrosion lining is fundamental to ductile iron pipe's performance and longevity in water systems. It provides essential protection against corrosion and erosion caused by the conveyed fluid, safeguards water quality, prevents leaks, and ultimately extends the pipe's service life decades beyond unlined alternatives.

In industrial production and infrastructure construction, carbon steel pipes have become the core carrier for the transportation of liquids, gases and other media with their high strength and wide adaptability. Their performance stability and cost advantages make them occupy an irreplaceable position in many fields and are important basic materials to support industrial operations and engineering construction. ​

The classification of ductile iron pipes first depends on their joint connection types, which directly determine installation methods and engineering adaptability. The most common flexible push-on joints (such as Tyton joints) utilize compressed rubber gaskets to achieve self-sealing, allowing post-installation angular deflection (typically 3-5 degrees) to accommodate ground settlement or thermal movement. Another type, mechanical joints (like K-type or Fastite joints), employ bolted gland rings to compress wedge-shaped gaskets, providing higher sealing integrity suitable for pump station valve connections requiring frequent maintenance. Flanged joints feature steel flanges cast or welded to pipe ends, creating rigid connections via high-strength bolts, specifically designed to withstand high-pressure thrust or interface with industrial equipment.

A flange adapter is a connector used to join two different types of flanges when they cannot be directly mated. Available in multiple sizes and materials—such as steel, PVC, and brass—these adapters are essential in piping engineering, HVAC systems, and water supply/drainage networks, particularly for connecting flanges of dissimilar materials.

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