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The following points need to be considered when selecting a water meter: Measurement requirements: Select the appropriate water meter type according to the flow rate and accuracy requirements to be measured. Installation environment: Consider the environment in which the water meter is installed, such as whether special

The key distinction lies in graphite morphology: cast iron pipe has flake graphite, making it brittle, while ductile iron pipe forms nodular graphite via magnesium/cerium addition, combining corrosion resistance with steel-like strength and ductility.In performance, ductile iron pipe excels with higher strength, toughness, lighter weight, and superior pressure/impact resistance, enabling easier installation; cast iron pipe is stiff, brittle, and heavy, prone to fracture.Consequently, applications diverge: ductile iron dominates pressurized systems (e.g., water/gas mains); cast iron is relegated to drainage or noise-sensitive niches.

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.