Check Valve

I. Product Features: Perfect Fusion of Innovative Design and Reliable Performance

(A) Structural Types and Technical Advantages

1. Swing Check Valves
   • Single/Double Disc Design: Single-disc for DN50-DN600 (Cv=0.8); double-disc (DN800+) reduces closing time by 30% and water hammer by 50%.
   • Elastomeric Sealing: PTFE seat inserts (-196℃ to 200℃) combined with Stellite®6 hardfacing (HRC58-62) achieve API 598 Class IV sealing (≤0.1cc/min leakage).
2. Lift Check Valves
   • Spring-Assisted Operation: Stainless steel springs (180GPa modulus) ensure sealing at 0.05MPa, ideal for pump discharges and vacuum systems.
   • Streamlined Disc: CFD-optimized flow path reduces resistance by 15% compared to conventional designs, saving energy costs.
3. Dual Plate Check Valves
   • Hinge-Free Design: Two plates 联动 via central spring prevent jamming from particles, suitable for slurries (e.g., mining, pulp).
   • Compact Length: Only 1/3 the length of swing valves, saving installation space and support costs.

(B) Material and Sealing Solutions

II. Manufacturing Process: Perfect Integration of Precision Control and Innovative Technology

(A) Key Manufacturing Processes

1. Precision Casting/Forging
   • Investment casting achieves ±0.1mm dimensional accuracy and Ra≤3.2μm internal finish;
   • Forged valves (Class 900+) exhibit 20% higher density and 50% longer fatigue life.
2. Sealing Surface Treatment
   • 5-axis grinding ensures seat flatness ≤0.002mm;
   • Plasma-welded Stellite®6 layers offer ≥450MPa bond strength with ±0.05mm thickness control.
3. NDT and Pressure Testing
   • 100% ultrasonic testing (UT) with Φ2mm sensitivity;
   • Helium mass spectrometry leak detection (≤1×10⁻⁹Pa·m³/s) and hydrostatic testing (1.5x rating, 30-minute hold).

III. Product Applications: Trusted Solutions for Global Industries

(A) Oil & Gas Industry

• Wellhead Equipment: Sulfide-resistant dual plate valves (NACE MR0175) operate reliably for 10+ years in H₂S-containing pipelines;
• LNG Terminals: Cryogenic lift valves (-196℃) for BOG recovery systems meet ISO 28300 standards.

(B) Chemical & Petrochemical

• Polyester Plants: Spring-loaded valves ensure zero leakage in ethylene glycol lines (2.5MPa, 180℃), reducing maintenance costs by 40%;
• Chlor-Alkali Industry: Titanium swing valves resist wet chlorine corrosion for 8+ years, outperforming stainless steel alternatives.

(C) Power & Energy

• Nuclear Power Plants: Welded check valves (ASME BPVC Section III) for main feedwater systems withstand ≥100,000 cycles;
• Wind Turbines: Miniature valves (DN15-DN50) control hydraulic systems with ≤0.1s response time for pitch safety.

(D) Municipal & Environmental

• Wastewater Treatment: Large-diameter double-disc valves (DN1200-DN2400) reduce water hammer by 60% in pump stations;
• Drinking Water Systems: 316L SS valves meet NSF 61 for potable water safety.

IV. Competitive Advantages: TIANYU’s Core Strengths

1. Rapid Response and Low Energy Consumption
   • Spring-assisted valves close ≤0.2s, preventing water hammer;
   • Optimized flow paths save $150,000 annually in electricity costs for a refinery.
2. Global Certifications and Customization
   • 20+ international certifications (API 6D, CE-PED, GOST-R) ensure global market access;
   • Special designs (fire-safe, cryogenic) and OEM/ODM services available.
3. Smart Monitoring and Lifecycle Support
   • Optional vibration sensors and wireless modules enable real-time condition monitoring;
   • Global service network covers five continents with 72-hour onsite response.
4. Sustainability Commitment
   • 95% recyclable materials and valve refurbishment reduce customer costs by 50%;
   • Low-carbon manufacturing cuts carbon footprint by 25% compared to industry peers.

V. TIANYU Brand: Reliable Partner for Global Industrial Clients