Swing Check Valves

I. Product Features: Innovative Design Meets Reliable Performance

(A) Structural and Sealing Technology

• Single/Double Disc Options:
  • Single Disc (DN50-DN600): Streamlined disc reduces flow resistance (Cv=0.8), cutting pressure drop by 15% for steam and oil pipelines.
  • Double Disc (DN800+): Symmetrical discs balance impact forces, shortening closing time by 30% and reducing water hammer by 50% for large-diameter systems.
• Multi-Level Sealing System:
  • Stellite®6 alloy overlay (HRC58-62) on seats/discs, precision-lapped to ≤0.003mm flatness, achieving API 598 Class IV sealing (≤0.1cc/min leakage). Metal hard seals meet bubble-tight Class VI for 25MPa steam and corrosive media like wet chlorine.

(B) Material and Application Matrix

II. Manufacturing Processes: Precision Forging and Quality Control

(A) Key Manufacturing Steps

1. Die Forging Technology:
   • 1600-ton presses refine grains to ASTM No.10+ (forging ratio ≥4:1), enhancing fatigue resistance by 50% for Class 2500 applications.
   • 100% ultrasonic (UT) and magnetic particle (MT) testing detects ≥Φ2mm defects in critical components.
2. Precision Machining:
   • 5-axis CNC machines achieve Ra≤0.4μm seat roughness and ISO 7-grade pivot hole precision for smooth operation.
   • Plasma overlay welding ensures 2-3mm Stellite®6 layers with ≥450MPa bond strength, X-ray verified for defect-free quality.
3. Full-Dimension Testing:
   • Hydrostatic Test: 1.5x nominal pressure held for 30 minutes (e.g., 13.5MPa for Class 900), no pressure drop.
   • Gas Seal Test: 1.1x pressure with helium mass spectrometry, leakage ≤1×10⁻⁹Pa·m³/s for top-tier sealing.

III. Product Applications: Solutions for Diverse Industrial Challenges

• Oil & Gas: Sulfur-resistant double discs (NACE MR0175) operate 8+ years in H₂S pipelines; cryogenic models (-196℃) with API 6A PR2 certification secure LNG loading arms.
• Chemical & Petrochemical: Hastelloy C-276 valves last 10+ years in 60% HF environments (5x longer than standard SS); single discs prevent backflow in polyester plants, cutting maintenance costs by 40%.
• Municipal & Environmental: DN1200 double discs with hydraulic dampers reduce water hammer by 60% in wastewater pumps; 316L SS valves meet NSF 61 for potable water safety.

IV. Advantages: TIANYU’s Global Competitiveness

1. Low Resistance & Impact Resistance:
   Hydrodynamic disc angle (65°±5°) cuts flow resistance by 20%, saving 10% annual pumping energy; double discs absorb shocks to extend pipeline life.
2. Customization & Global Certifications:
   Fire-safe (API 607), anti-static (ISO 10497), and anti-frost designs available, with 20+ certifications (API 6D, CE-PED, GOST-R) for global compliance.
3. Intelligent Services & Lifecycle Value:
   Optional position sensors (±0.5% accuracy) for real-time monitoring; 6 global service centers offer 24-hour response and 48-hour emergency parts delivery, reducing maintenance costs by 50%.
4. Sustainability Commitment:
   95% recyclable components, 35% lower energy use in forging, and 200kg CO₂e reduction per DN1000 valve, meeting EU CE environmental standards.