Ductile Iron Flanged Gate Valve Manual Fire Fighting Valve for Water Ductile Iron Flanged Gate Valve

In municipal infrastructure and industrial fluid transportation, reliable yet economical fluid isolation solutions are paramount. The TIANYU Ductile Iron Flanged Gate Valve excels through superior material properties, precision manufacturing, and exceptional value, establishing itself as a trusted flow control component in water treatment, HVAC, and general industrial piping systems – delivering steadfast operational security.

Core Positioning: Optimal Balance of Strength and Economy
Designed as a flanged wedge gate valve, it masterfully balances performance and cost. Its ductile iron body (ASTM A536) features a unique spherical graphite microstructure, offering near-steel strength, excellent toughness, and impact resistance while retaining casting efficiency and vibration-damping properties. This makes it ideal for low-to-medium pressure ambient-temperature applications.

II. Core Features: Balanced Design of Performance and Economy

1. Material Advantage: Engineering Properties of Ductile Iron
   The valve body uses QT450-10 ductile iron (complying with GB/T 1348 standards). After high-temperature annealing, it achieves tensile strength ≥450MPa, elongation ≥10%, and impact resistance 5 times higher than ordinary gray cast iron—approaching the level of low-carbon steel. The surface is sprayed with an epoxy resin anti-corrosion coating (thickness ≥200μm), extending service life by 2~3 years compared to ordinary cast iron valves in humid environments or chloride-containing media.
2. Sealing System: Dual Seals for Zero Leakage
   The valve seat is made of EPDM or NBR rubber, forming a “soft seal + hard seal” dual structure with the ductile iron gate’s metal base: The rubber seal achieves bubble-tight sealing (leakage ≤0.01cm³/min per API 598 testing), while the metal base provides backup sealing under high pressure or temperature to prevent leakage risks from rubber aging.
3. Structural Optimization: Easy Operation and Long Life
   The outside stem (OS&Y) design visually indicates the opening/closing status via stem extension. Combined with a copper alloy nut and graphite grease, it reduces opening/closing torque by 25%, with manual operation force ≤150N·m (DN300 specification). The bonnet and body are bolt-connected, allowing online replacement of sealing packing without pipeline disassembly—shortening maintenance time by 40%.
4. Working Condition Adaptability: Wide-range Environmental Compatibility

• Temperature Adaptability: From -10°C low-temperature scenarios (e.g., winter water supply in northern regions) to 120°C hot water circulation systems (e.g., central heating networks).
• Medium Compatibility: Freshwater, sewage, seawater (upgradable to FIB cast iron), light oil products (diesel, kerosene), compressed air, etc.
• Pressure Stability: PN10~PN16 pressure ratings cover over 90% of civil and industrial medium-low pressure pipelines, with a maximum withstand of 1.6MPa static pressure testing.

III. Key Attributes: Technical Parameters and Standard Compliance

IV. Manufacturing Processes: Full-process Control from C