High-Precision Quality Valve Balls Technical Specification

1. Product Overview

2. Structural Types

• Nominal Size: DN15 (1/4") ~ DN1000 (40")
• Design Type: Full port, Reduced port, Straight, L-type, T-type, V-type, 3-way, 4-way, Stemmed ball
• Pressure Class: PN16 ~ PN420 (Class150 ~ Class2500)
• Compliance Standard: GB/T, ANSI, API 6D, DIN, ISO

3. Material Selection

3.1 Metallic Materials

• F304 (304 Stainless Steel): Good general corrosion resistance; Working temperature: -20℃ ~ 450℃; Application: Water supply, food & pharmaceutical industry
• F316L (316L Stainless Steel): Low carbon grade, anti-intergranular corrosion; Ideal for chemical industry, seawater and sterile fluid systems
• F51 / F53 (Duplex Stainless Steel): High mechanical strength and chloride resistance; Used for seawater desalination and salt chemical industry
• 17-4PH: Precipitation hardening steel with high strength and wear resistance; Suitable for high-pressure and frequent cycling working conditions
• Monel 400: Resistant to hydrofluoric acid and strong alkali; Applied in special chemical and hydrogenation units
• Inconel 625: Excellent high temperature resistance up to 650℃ and strong corrosion resistance; For high-temperature high-pressure and coal chemical working conditions

3.2 Zirconia Ceramic

• Hardness: Mohs 9 grade, Vickers Hardness ＞1200kg/mm², outstanding wear resistance
• Working Temperature: -40℃ ~ 750℃, stable thermal performance
• Chemical Property: Inert material, resistant to strong acid, alkali, salt and organic solvents
• Service Life: 3~5 times longer than conventional metal valve balls; Fit for media with solid particles and abrasives

4. Manufacturing Process

1. Raw Material Inspection: Forged bars & solid bars with spectral analysis and non-destructive testing
2. Forging & Heat Treatment: Refine grain structure, eliminate internal stress, improve strength and toughness
3. 5-axis CNC Machining: Dimensional tolerance within ±0.005mm
4. Spherical Grinding & Mirror Polishing: Professional grinding equipment for ultra-smooth surface
5. Surface Enhancement: ENP, TCC, STL, HCR, DLC coating with controllable thickness
6. Final Inspection: Roundness test, roughness test, CMM inspection, sealing test and salt spray test

5. Key Technical Parameters

• Roundness: ≤ 0.01 mm
• Sphericity: ≤ 0.02 mm
• Surface Roughness: Ra 0.2 ~ 0.4 μm (Mirror finish)
• Dimensional Tolerance: IT6 ~ IT7
• Sealing Grade: ANSI Class VI (Zero leakage)
• Operation Cycle: ≥ 5,000 cycles (Soft seat); ≥ 10,000 cycles (Metal/ceramic seat)

6. Product Performance Advantages

• Reliable Sealing: Micron-level spherical surface ensures perfect contact with valve seats and zero leakage
• Flexible Operation: Low-friction mirror surface reduces operating torque, compatible with pneumatic and electric actuators
• Superior Durability: Premium materials and reinforced coatings resist erosion, corrosion and abrasion
• Wide Application Range: Adapt to diversified temperature, pressure and medium conditions
• Low Maintenance: Long service life minimizes downtime and after-sales maintenance cost

7. Applicable Industries & Media

• Industries: Oil & Gas, Petrochemical, Coal Chemical, New Energy, Municipal Water Supply, Seawater Desalination, Pharmaceutical, Food, Papermaking, Flue Gas Desulfurization
• Media: Water, Steam, Oil, Natural Gas, Acid & Alkali Solution, Organic Solvent, Particle-containing Media, Sterile Fluid

8. Quality Standard & Certification

• Executive Standards: T/ZZB 1964—2020, API 6D, ANSI B16.34, GB/T 13927
• Certifications: ISO 9001, CE
• Supporting Documents: Material Certificate, NDT Report, Dimensional Inspection Report, Sealing Performance Report

9. Customization Service