Description

TECHNICAL DATA SHEET

Product: 3-Piece Trunnion Mounted Ball Valve – Metal Seated
Size: 4″ x 3″ (Reducer Bore / Reduced Port)
Pressure Class: Class 1500
Body Material: F316L (ASTM A182 F316L)
Seat Type: Metal‑to‑Metal Seated
Design: 3-Piece Body, Trunnion Ball

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1. Basic Specifications

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2. Main Features

• Trunnion Mounted Ball: Ball is supported by upper and lower trunnion bearings, reducing operating torque and ensuring smooth operation under high differential pressure. Ideal for large sizes and high‑pressure applications.

• Reduced Bore (4″ x 3″): 4″ flanged connections with a 3″ internal bore reduces weight and cost while maintaining adequate flow capacity.

• 3-Piece Body Construction: Center body with bolted end caps allows easy in‑line maintenance – seats, ball, and seals can be accessed without removing the entire valve from the pipeline.

• Metal‑to‑Metal Seating: Ball and seats are hardfaced with wear‑resistant alloys (e.g., tungsten carbide, chromium carbide, or Stellite). Provides exceptional durability in high‑temperature, abrasive, and erosive services.

• Spring‑Loaded Seats: Metal seats are typically pre‑loaded with Inconel springs to maintain continuous contact with the ball, ensuring tight shut‑off even under low pressure or thermal cycling.

• Double Block & Bleed Capability: With two independent metal seats, the cavity between seats can be vented or monitored.

• Anti‑Static Device: Ensures electrical continuity between ball, stem, and body.

• Blowout‑Proof Stem: Stem is designed to prevent ejection under pressure.

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3. Material List (Metal Seated Configuration)

Note: Hardfacing materials can be customized based on media and temperature (e.g., Stellite 6, Stellite 21, tungsten carbide).

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4. Hardfacing Options for Metal Seats

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5. Dimensions & Structural Data (Flanged Ends)

Note: Final dimensions to be confirmed by manufacturing drawings.

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6. Design & Testing Standards

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7. Metal Seated vs. Soft Seated Comparison

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8. Operating Torque & Actuator Sizing

• Higher Torque Requirement: Metal seated valves require significantly higher torque than soft seated valves due to metal‑to‑metal contact and spring preload.

• Trunnion Advantage: Despite higher torque, the trunnion design reduces torque compared to a floating ball of the same size.

• Safety Factor: Actuator output torque should be at least 1.3 – 1.5 times the maximum measured valve torque.

• Breakaway Torque: Especially critical after prolonged closure; may be higher than running torque.

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9. Typical Applications

• High‑Temperature Processes: Refinery thermal cracking units, FCCU slurry, steam systems up to 500°C.

• Abrasive Media: Catalyst lines, mining slurries, sand handling.

• Sour Service: With NACE MR0175 materials, suitable for high‑pressure sour gas.

• Offshore & Subsea: Corrosion‑resistant F316L with metal seats for reliability in demanding environments.

• Chemical Processing: Handling corrosive fluids at elevated temperatures.

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10. Ordering Information

When ordering, please specify:

• Size: 4″ x 3″ (Reduced Bore)

• Pressure Class: Class 1500

• Body Material: F316L

• Seat Type: Metal Seated (specify hardfacing: WC / CrC / Stellite)

• End Connections: Flanged – ASME B16.5 Class 1500 (RF or RTJ)

• Optional Features: NACE MR0175, cryogenic trim (if required), spring‑loaded seats, actuator mounting

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This data sheet reflects the metal seated configuration for the 4″ x 3″ – 1500LB F316L 3-Piece Trunnion Ball Valve. For full bore versions, soft seated options, or additional customizations, please contact us with your specific requirements.