API 6000# Trunnion Ball Valve
API 6000# Trunnion Ball Valve - Image 2
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API 6000# Trunnion Ball Valve

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Description

API 6A Trunnion Ball Valve Technical Data Sheet

Product Name: API 6A Trunnion-Mounted Ball Valve
Design Standard: API 6A / ISO 10423
Application: Oil and gas wellhead equipment, Christmas trees, pipelines, and harsh environments (including H₂S/CO₂ sour service, high pressure, high/low temperature).

1. Basic Model & Size Range

Item Standard Specification Optional Customization
Nominal Bore (DN) 2-1/16″ ~ 13-5/8″ (approx. 52mm ~ 346mm) 1-13/16″ ~ 20-1/4″ or larger
Pressure Rating 2,000 psi ~ 5,000 psi 10,000 psi ~ 20,000 psi
Temperature Rating Class K: -60°F ~ +180°F (-60°C ~ +82°C)
Class L: -50°F ~ +180°F (-46°C ~ +82°C)		 Class U: 0°F ~ +350°F (-18°C ~ +180°C)
High/Low Temp Custom: -328°F ~ +932°F (-196°C ~ +500°C)
Product Specification Level (PSL) PSL 1 ~ PSL 3G PSL 4 (Project-based)
Performance Requirement (PR) PR 1 (Standard closure) PR 2 (High-cycle/stringent closure)

2. Design & Manufacturing Standards

Item Standard / Code
Design & Manufacturing API 6A / ISO 10423, API 6D (Referenced)
End Connections ASME B16.5 (Flanged), ASME B16.25 (Butt-weld), Hubbed, Clamp Connectors
Testing & Inspection API 6A / ISO 10423, API 598
Fire Safe Design API 6FA, API 607, BS 6755 Part 2
Sour Service (NACE) NACE MR0175 / ISO 15156 (Material Requirements)
Top Flange Mounting ISO 5211 (For direct actuator mounting)

3. Key Technical Parameters

Parameter Category Description / Value
Body Type Two-piece or Three-piece bolted body, Forged Steel construction.
Optional: Top Entry design for in-line repair.
Operation Type Manual (with locking device), Pneumatic, Electric, Hydraulic, Pneumatic-Hydraulic.
Sealing Class Soft Seated: Zero Leakage (API 6A / ISO 5208 Rate A).
Metal Seated: FCI 70-2 Class 5 or Class 6.
Flow Direction Bidirectional (Standard) or Unidirectional.
Seat Design Spring-assisted / Pressure-assisted sealing.
Optional: Single Piston Effect (SPE) / Double Piston Effect (DPE) / Double Block and Bleed (DBB) functionality.
Relief Function Automatic Body Pressure Relief (Upstream seat disengages when cavity pressure exceeds 1.33 times the rated pressure).

4. Material of Construction (Typical)

Materials must comply with NACE MR0175 requirements based on PSL and sour service conditions.

Component Standard Material Options Corrosion Resistant / Special Alloy Options
Body / Bonnet Carbon Steel (e.g., 60K, 75K) Stainless Steel (316/316L), Duplex Stainless Steel, Alloy 625 (Inconel)
Ball / Trunnion / Stem Stainless Steel (AISI 410/17-4PH) + Coating Stainless Steel + Stellite 6 Hardfacing / Tungsten Carbide Coating (HVOF)
Seat Support Ring Carbon Steel / Stainless Steel Stainless Steel + Stellite Hardfacing
Seal Ring (Insert) PTFE, PEEK, Nylon, Devlon (self-lubricating) Reinforced PTFE / Metal-to-Metal (with Graphite)
Bearings / Bushings Self-lubricating Composite Material (e.g., PTFE composite) Tungsten Carbide coated journals
Stem/Trunnion Sealing NBR, FKM (Viton) TFM (Modified PTFE) / Lip Seals + Fire-safe Graphite Packing

5. Features & Design Advantages

  1. 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.

  2. Anti-blowout Stem: The stem is internally retained by the bonnet shoulder, preventing stem ejection under abnormal high pressure.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

6. 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.

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