Flange Size Optional 360° Metal Lip Fixed Bidirectional Flow Soft Seal Plug Valve Sleeve Type Soft Sealing Plug Valve

III. Structural Design & Technical Features

1. 360° Metal Lip Disc
   • Self-Balancing Rebound Design: The lip disc edge features a 45° bevel that automatically conforms to the seat using media pressure, achieving bidirectional bubble-tight sealing with specific pressure ≥15MPa.
   • Low Flow Resistance: Flow resistance coefficient ≤0.7 (DN100), 35% lower than traditional swing check valves, suitable for media velocity ≤10m/s.
   • Jamming-Free Structure: No moving pins between disc and seat prevent blockage by particles (≤2mm), ideal for sewage containing suspended solids.
2. Full-Bore Streamlined Design
   • The body uses an equal-diameter flow path with polished inner wall (Ra≤6.3μm) to minimize media deposition and scaling, ensuring long-term operation in sewage pipelines.
   • Wafer-type structure is only half the length of flanged valves, reducing weight by 40% and saving installation space and pipeline support costs.
3. Environmental Adaptability
   • Low-Temperature Toughness: Ductile iron disc maintains impact toughness ≥30J/cm² at -40℃ to prevent cold cracking.
   • High-Temperature Stability: 316 stainless steel withstands creep strength ≥120MPa at 232℃ for reliable long-term sealing.

IV. Manufacturing Processes & Quality Control

1. Precision Casting & Machining
   • Body Casting: Ductile iron parts use lost foam casting with graphite nodularity ≥90% (GB/T 1348), 100% ultrasonic testing (UT) for internal defects.
   • Sealing Surface Treatment: Metal lip edges are CNC ground with angle deviation ≤0.5°, contact rate ≥85% verified by red lead test.
2. Surface Protection Technology
   • Carbon steel bodies are hot-dip galvanized (coating thickness ≥85μm), passing 1000-hour salt spray test (ASTM B117).
   • Stainless steel parts undergo pickling and passivation to form a dense oxide film, improving chloride resistance by 50% (Cl⁻≤5000ppm).
3. Comprehensive Testing System
   • Hydrostatic Test: 1.5x pressure (2.4MPa for PN16) held 30min, 1.1x sealing pressure—zero leakage.
   • Particle Tolerance Test: Passes continuous 冲刷 test with 1mm particles, seal wear ≤0.08mm after 10,000 cycles.
   • Certifications: ISO 9001:2015, CE-PED 2014/68/EU, provides Material Test Reports (MTR) and pressure test certificates.