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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.

Beneath our cities and within our walls, UPVC and HDPE pipes form the hidden circulatory systems of contemporary infrastructure. These polymer pipes have steadily replaced traditional materials, each bringing distinct advantages to different applications.

The self-anchored ductile iron pipe adopts a special mechanical design to weld the ring to the socket end to achieve reliable anchoring performance, while retaining the flexibility of the joint, with good flexural performance, which can replace the function of the constraint block and realize the design without constraint blocks.

The Flanged Resilient Non-Rising Stem (NRS) Gate Valve is a shut-off valve with flanged connections and a non-ascending stem. Its core design features a rubber-coated wedge gate (Resilient Seat) and a non-rising stem mechanism. Rotating the handwheel drives the stem nut to move the gate vertically, sealing or opening the pipeline. Compliant with BS 5163/EN 1074 standards (pressure ratings PN10/16), the valve combines the strength of a metal body with zero-leakage elastic sealing.

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.

A pipe flange adapter is a critical connector used in piping systems to join flanged equipment or pipelines with different end connections. Instead of relying on welding or threading alone, flange adapters provide a versatile interface that allows secure fastening, disassembly, and maintenance. They are commonly installed in applications where durability, leak resistance, and easy installation are required.