Straight Globe Valve

I. Product Features: Deep Integration of Structural Design and Technical Innovation

• Disc Types and Sealing Systems
  • Plunger Disc: Suited for high-pressure differential applications (e.g., Class 2500), with conical sealing surfaces (30°-45° angle) achieving 30MPa sealing specific pressure and leakage rates below API 598 Class IV.
  • Multi-Stage Pressure Reducing Disc: For high-pressure gas throttling (e.g., blowdown systems), porous or cage-type structures distribute pressure drops, controlling noise below 85dB and preventing cavitation.
• Optimized Flow Path
  The straight-through S-shaped flow path reduces stroke length (20% faster operation than angle types) and incorporates flow-guiding vanes to minimize eddies. Cv values are 15% higher than traditional globe valves, ideal for high-viscosity oils (e.g., asphalt).
• High-Temperature/Pressure Adaptability
  Stems use A182 F91 heat-resistant steel (650℃ tolerance), paired with bellows + flexible graphite seals, ensuring zero leakage in a thermal power plant’s main steam pipeline (25MPa, 540℃).
• Corrosion-Resistant Materials
  Body materials include CF8M (316L SS, ≤2000ppm Cl⁻), Hastelloy C-276 (aqua regia resistance), with Stellite®6 overlay (HRC58-62) on sealing surfaces for chemical industry applications.

II. Manufacturing Processes: Full-Process Precision Quality Control
TIANYU Straight Globe Valves comply with ASME B16.34, API 602, and other standards, leveraging smart workshops for innovation:

1. 3D Simulation and Structural Optimization
   ANSYS CFD modeling optimizes disc angles and flow path curvature, reducing pressure drop by 20%. For LNG cryogenic valves, simulations prevent disc vibration from media flashing.
2. Precision Casting and Machining
   • Vacuum Casting: Vacuum melting + low-pressure casting refines grain structure to ASTM E112-12 Grade 10+, boosting tensile strength to 700MPa (A216 WCB).
   • 5-Axis Machining: Seat surfaces achieve Ra≤0.2μm roughness; disc-stem thread fit meets ISO 4753-1 precision for smooth operation.
3. Surface Treatment and Enhancement
   • Nitriding: Ion nitriding on stems creates 0.3-0.5mm depth layers (HV1200 hardness), 5x wear resistance for frequent operation (e.g., compressor bypass valves).
   • Overlay Welding: Pulsed plasma welding ensures 1.5-2.0mm Stellite®6 layers, inspected via fluorescent penetrant testing for defect-free bonding.
4. Comprehensive Testing
   • Pressure Tests: 1.5x shell test (1-hour hold) + 1.1x seal test (30-minute hold) with electronic pressure logging.
   • Life Testing: 100,000-cycle tests under simulated conditions (e.g., high-pressure steam) maintain ≥95% sealing performance, exceeding API 6D’s 80% requirement.

III. Advantages: Core Competitiveness of TIANYU Brand

1. Superior Flow Control Accuracy
   Equal percentage discs with smart positioners (0.1% resolution) achieve ±0.5% flow control, outperforming standard ±2% precision for fine chemical dosing.
2. Robust Performance in Harsh Conditions

• Cryogenic Resistance: Passed -196℃ liquid nitrogen impact tests, suitable for LNG BOG pipelines.
• High-Pressure Sealing: Rigid metal seals maintain zero leakage at Class 4500 (60MPa), exceeding API 6D requirements.

3. Intelligent and Maintenance-Friendly Design
   Explosion-proof electric actuators (IP68) and position transmitters support 4-20mA signaling; quick-disconnect bonnets reduce packing replacement time to 30 minutes.
4. Customization and Global Certifications
   Offers anti-cavitation, anti-erosion, and low-noise solutions, certified to API 602, CE-PED, TSG ZF, etc. Exported to 40+ countries, praised in projects like Saudi Jubail Petrochemical Complex.