Industry News

PVC-M pipe, fully termed Modified Polyvinyl Chloride Pipe for Impact Resistance, represents an advanced evolution of traditional PVC-U (unplasticized polyvinyl chloride) piping. Its core breakthrough lies in polymer toughening technology, which introduces elastomer particles (such as chlorinated polyethylene CPE or acrylic copolymer ACR) into the PVC matrix to form a "sea-island" composite structure. This modification enhances impact strength by 3-5 times and increases elongation at break by over 50% compared to PVC-U, fundamentally addressing the inherent brittleness and susceptibility to sudden fracture in conventional PVC-U pipes.

The Y-type strainer stands as the most widely used mechanical filtration device in industrial piping systems, its name derived from the distinctive Y-shaped configuration of its housing. Its core function is to intercept solid particulate impurities within fluids (such as rust, welding slag, pipe scale, or process residues) through an internal strainer screen, thereby protecting downstream equipment (pumps, valves, flow meters, heat exchangers, etc.) from wear or blockage. The operating principle involves: fluid entering the strainer housing via the inlet, flowing through an angled cylindrical screen where contaminants are trapped on the inner surface, while clean fluid passes through the mesh openings to the outlet. Accumulated debris can be removed by manually or automatically opening the drain valve at the bottom.

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.

Choosing between K7 and K9 requires a comprehensive assessment of design pressure, safety factors, environmental risks, and lifecycle costs. In conventional municipal engineering, K9 is the preferred choice due to its reliability and versatility. K7 requires careful evaluation of operating conditions to avoid pipe failure risks from excessive thinning. Both classes reflect the core design logic of ductile iron pipes—trading wall thickness for structural strength—offering a technical classification system that balances safety and cost efficiency.