III. Structural Features and Design Advantages

• Efficient Filtration and Low Resistance:
  The Y-shaped flow channel design creates a gentle 涡流 (vortex) when media flows through, with impurities trapped at the bottom of the filter mesh by both gravity and centrifugal force. Filtration efficiency is 15% higher than straight cylindrical strainers; the inner wall of the flow channel is smooth, with a local resistance coefficient ≤3.0, reducing system pressure loss and energy consumption.
• Material Durability:
  FCD 450 ductile iron undergoes isothermal quenching, combining high strength with good toughness. It is less likely to crack under vibrating conditions (such as hydraulic pump outlets), with a service life over twice that of ordinary cast iron strainers; the stainless steel mesh is rust-resistant and can be repeatedly cleaned for reuse, reducing consumable costs.
• Sealing Reliability:
  Non-asbestos gaskets contain no asbestos, meeting environmental requirements, and can maintain stable sealing under PN25 pressure to prevent media leakage; the gasket fits tightly with the flange surface, eliminating the need for over-tightening bolts during installation, reducing the risk of flange deformation.
• Multi-Standard Compatibility:
  The same diameter can match multiple flange standards such as JIS, ANSI, and PN, allowing adaptation to pipeline systems in different regions without replacing the strainer body, especially suitable for multinational projects or imported equipment supporting.
• Convenient Maintenance:
  The top features a threaded cover or flange cover design. After disassembly, the filter mesh can be directly removed for cleaning or replacement, with maintenance taking only 10 minutes (for standard models) without interrupting the entire pipeline system.

IV. Manufacturing Processes and Quality Control

1. Material Selection and Casting:
   High-quality FCD 450 ductile iron ingots are selected, with chemical composition verified by spectral analysis (carbon equivalent 4.3~4.7%, silicon content 2.4~2.8%) to ensure mechanical properties meet standards; resin sand casting is used to reduce casting defects such as pores and shrinkage, with casting surface roughness ≤25μm.
2. Precision Machining:
   • Valve body flow channels and flange surfaces are machined by CNC lathes, with dimensional error ≤0.1mm to ensure smooth flow and connection tightness;
   • Filter meshes are woven from stainless steel wires, stamped and formed, with edges fixed by laser welding to prevent falling off during use;
   • Threaded interfaces (such as NPT/BSPT) are machined to DIN2999 standards, with complete thread profiles and reliable sealing.
3. Assembly and Testing:
   • A torque wrench is used during assembly to control bolt preload, ensuring uniform force on the gasket;
   • Each strainer undergoes: shell hydrostatic testing (1.5 times nominal pressure, 30-minute pressure holding without leakage); sealing testing (1.1 times nominal pressure, no bubble leakage); functional testing (simulating media flow to verify filtration efficiency).
4. Surface Treatment:
   The ductile iron surface is sprayed with anti-rust paint (dry film thickness ≥60μm), passing a 300-hour salt spray test to adapt to humid industrial environments.