说明
Three-Piece Flanged Ball Valve in Stainless Steel | Industrial-Grade High-Pressure Corrosion-Resistant Solution
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Core Structure and Design Differences
Unlike sanitary flanged ball valves, the three-piece flanged ball valve adopts asplit-body design(consisting of the valve body and left/right valve covers), connected by high-strength bolts. It is specifically designed for harsh industrial conditions, featuring:
1. Modular Maintenance: The valve cover can be disassembled without removing the pipeline, allowing direct replacement of the valve seat, ball, or seals, reducing maintenance costs.
2. Heavy-Duty Design: The valve body thickness is increased by 20%, and the flange is reinforced (complying with GB/ANSI/DIN standards), with a pressure rating ofPN16-PN40.
3. Non-Sanitary Applications: Suitable for petrochemical, power and energy, papermaking, and other industrial fields, handling particulate, high-viscosity, or corrosive fluids.
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Key Parameter Comparison (vs. Sanitary Valves)
FeatureThree-Piece Flanged Ball ValveSanitary Flanged Ball Valve
StructureThree-piece split, boltedOne-piece/Tri-Clamp quick connect
Seal MaterialMetal hard seal/Graphite packing/Reinforced PTFE (up to 300℃)Food-grade EPDM/Silicone (≤200℃)
Surface TreatmentSandblasting or matte finish (non-electrolytic polishing)Electrolytic polishing Ra≤0.8μm (mirror)
Pressure RatingPN16-PN40 (up to 63 bar)PN10 (10 bar)
Applicable Media Steam, oil & gas, acid/alkali solutions, slurries Food, pharmaceuticals, sterile liquids
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Product Advantages
1. High-Pressure & High-Temperature Resistance
• Forged 316/304 stainless steel body, withstanding temperatures from-196℃ to +300℃, suitable for LNG or steam pipelines.
2. Bi-directional Sealing Design
• Double valve seats (upstream + downstream), achievingzero leakage (API 598 standard)for bi-directional flow.
3. Long-Term Maintenance-Free
• Metal hard seals lastover 100,000 cycles, suitable for particulate-laden media.
4. Flange Compatibility
• Supports GB, ANSI 150/300LB, DIN flanges, matching industrial piping systems.
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Typical Industrial Applications
• Petrochemical Refining: Emergency shut-off valve for crude oil pipelines.
• Power & Heating: Flow control in steam main pipelines.
• Papermaking: Control valve for thick paper pulp.
• Water Treatment: Acid/alkali control in high-pressure reverse osmosis systems.
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Selection Guide
SizePressure RatingSeal TypeActuator Recommendation
DN50PN25Metal hard sealPneumatic actuator (with handwheel)
DN100PN40Reinforced PTFE + GraphiteElectric actuator (explosion-proof)
DN200 PN16 Metal + soft seal composite Hydraulic actuator (high torque)
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Installation & Maintenance Tips
1. Pre-installation Check: Clear welding slag from the pipeline, ensure flange faces are parallel and aligned, avoid overtightening bolts to prevent valve body deformation.
2. Regular Maintenance: Inspect the valve stem packing gland every 6 months, replenish high-temperature grease (e.g., molybdenum disulfide).
3. Emergency Handling: For internal leakage, adjust the valve seat preload spring or replace the seal ring first, without needing to replace the entire valve.
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Differentiation Positioning: The three-piece flanged ball valve focuses onindustrial pressure resistance, wear resistance, and long lifespan, targeting harsh non-sanitary conditions, clearly distinguishing itself from sanitary valves’ “sterile, quick-disconnect, mirror-polished” attributes.
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