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API 6A Trunnion Ball Valve Technical Data Sheet
Product Name: API 6A Trunnion-Mounted Ball Valve
Tiêu chuẩn thiết kế: API 6A / ISO 10423
Ứng dụng: Oil and gas wellhead equipment, Christmas trees, pipelines, and harsh environments (including H₂S/CO₂ sour service, high pressure, high/low temperature).
- Basic Model & Size Range
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Item
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Standard Specification
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Optional Customization
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Nominal Bore (DN)
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2-1/16″ ~ 13-5/8″ (approx. 52mm ~ 346mm)
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1-13/16″ ~ 20-1/4″ or larger
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Xếp hạng áp suất
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2,000 psi ~ 5,000 psi
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10,000 psi ~ 20,000 psi
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Temperature Rating
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Class K: -60°F ~ +180°F (-60°C ~ +82°C) Class L: -50°F ~ +180°F (-46°C ~ +82°C)
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Class U: 0°F ~ +350°F (-18°C ~ +180°C) High/Low Temp Custom: -328°F ~ +932°F (-196°C ~ +500°C)
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Product Specification Level (PSL)
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PSL 1 ~ PSL 3G
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PSL 4 (Project-based)
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Performance Requirement (PR)
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PR 1 (Standard closure)
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PR 2 (High-cycle/stringent closure)
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- Design & Manufacturing Standards
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Item
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Standard / Code
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Design & Manufacturing
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API 6A / ISO 10423, API 6D (Referenced)
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End Connections
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ASME B16.5 (Flanged), ASME B16.25 (Butt-weld), Hubbed, Clamp Connectors
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Testing & Inspection
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API 6A / ISO 10423, API 598
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Fire Safe Design
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API 6FA, API 607, BS 6755 Part 2
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Sour Service (NACE)
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NACE MR0175 / ISO 15156 (Material Requirements)
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Top Flange Mounting
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ISO 5211 (For direct actuator mounting)
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- Key Technical Parameters
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Danh mục tham số
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Description / Value
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Body Type
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Two-piece or Three-piece bolted body, Forged Steel construction. Optional: Top Entry design for in-line repair.
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Operation Type
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Manual (with locking device), Pneumatic, Electric, Hydraulic, Pneumatic-Hydraulic.
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Sealing Class
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Soft Seated: Zero Leakage (API 6A / ISO 5208 Rate A). Metal Seated: FCI 70-2 Class 5 or Class 6.
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Flow Direction
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Bidirectional (Standard) or Unidirectional.
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Seat Design
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Spring-assisted / Pressure-assisted sealing. Optional: Single Piston Effect (SPE) / Double Piston Effect (DPE) / Double Block and Bleed (DBB) functionality.
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Relief Function
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Automatic Body Pressure Relief (Upstream seat disengages when cavity pressure exceeds 1.33 times the rated pressure).
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- Material of Construction (Typical)
Materials must comply with NACE MR0175 requirements based on PSL and sour service conditions.
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Thành phần
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Standard Material Options
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Corrosion Resistant / Special Alloy Options
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Body / Bonnet
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Carbon Steel (e.g., 60K, 75K)
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Stainless Steel (316/316L), Duplex Stainless Steel, Alloy 625 (Inconel)
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Ball / Trunnion / Stem
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Stainless Steel (AISI 410/17-4PH) + Coating
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Stainless Steel + Stellite 6 Hardfacing / Tungsten Carbide Coating (HVOF)
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Seat Support Ring
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Carbon Steel / Stainless Steel
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Stainless Steel + Stellite Hardfacing
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Seal Ring (Insert)
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PTFE, PEEK, Nylon, Devlon (self-lubricating)
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Reinforced PTFE / Metal-to-Metal (with Graphite)
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Bearings / Bushings
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Self-lubricating Composite Material (e.g., PTFE composite)
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Tungsten Carbide coated journals
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Stem/Trunnion Sealing
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NBR, FKM (Viton)
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TFM (Modified PTFE) / Lip Seals + Fire-safe Graphite Packing
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- Features & Design Advantages
- Trunnion-Mounted Ball / Floating Seat Design: The ball is supported by fixed upper and lower trunnions (shafts), minimizing deformation under high pressure. Seats are spring-loaded and pressure-assisted to ensure bubble-tight bidirectional sealing at both low and high pressures.
- Anti-blowout Stem: The stem is internally retained by the bonnet shoulder, preventing stem ejection under abnormal high pressure.
- Fire-safe Structure: Designed to API 6FA. In case of fire, if soft seats are destroyed, the ball contacts the metal seat backup to form a secondary metal-to-metal seal. A graphite secondary sealing element in the stem prevents external leakage.
- Anti-static Device: Springs and conductive balls are installed between the stem, ball, and body to ensure electrical continuity even with non-metallic seals, preventing static charge buildup.
- Emergency Sealant Injection: Optional sealant injection fittings are available for seats and stem. In case of accidental seal failure, special sealant can be injected to temporarily restore sealing.
- Double Block and Bleed (DBB): In the fully closed position, the valve isolates both upstream and downstream pressure simultaneously. The body cavity pressure can be relieved via a bleed valve to verify seal integrity.
- In-line Maintenance (Top Entry): Top entry design allows for replacement of internal components like the ball and seats without removing the valve body from the pipeline.
- Options & Accessories
- Extended Bonnet: For cryogenic/low-temperature applications.
- Drain / Vent Connections: Threaded connections with plug indicators.
- Position Indicator: Visual open/closed indication.
- Locking Device: To prevent unauthorized operation.
- Actuator Mounting Pad: Standardized to ISO 5211.
CAM KẾT:
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