What Are the Key Features of Triple Eccentric Butterfly Valves?

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Triple eccentric butterfly valves (also known as triple offset valves) are high-performance valves designed for critical sealing applications in industries like oil & gas, power plants, and chemical processing. Their unique design ensures zero leakage, long service life, and fire-safe operation.

In this guide, we’ll explore:
🔹 What Makes Triple Eccentric Valves Different?
🔹 Key Features & Benefits
🔹 STV’s Premium Triple Eccentric Butterfly Valve Example

1. What Makes Triple Eccentric Valves Unique?

Unlike standard butterfly valves, triple eccentric valves have three key offsets:

1. First Offset – The shaft is positioned behind the disc centerline (reduces friction).

2. Second Offset – The shaft is offset from the pipe centerline (enables cam action).

3. Third Offset – The seat cone angle is offset from the disc, ensuring metal-to-metal sealing.

This design eliminates sliding friction, making them ideal for high-pressure, high-temperature, and abrasive media.

2. Key Features of Triple Eccentric Butterfly Valves

✅ Zero Leakage (Bubble-Tight Seal)

• Metal-to-metal seating (no soft seals that degrade over time).

• Meets API 598, ISO 5208, and TA-Luft standards for fugitive emissions.

✅ Fire-Safe Design

• Complies with API 607/6FA (prevents failure in fire emergencies).

• Graphite or metal secondary seals ensure backup sealing.

✅ High Pressure & Temperature Resistance

• Handles Class 150 to Class 2500 (PN10 to PN420).

• Suitable for -196°C to 600°C (-320°F to 1112°F).

✅ Low Operating Torque

• No rubbing friction during operation (extends actuator life).

• Ideal for automated systems (electric/pneumatic actuation).

✅ Corrosion & Wear Resistance

• Available in stainless steel (SS316, Duplex), nickel alloys (Inconel), and bronze (C95500).

• Hard-coated discs for abrasive slurry applications.

3. Example: STV’s Premium Triple Eccentric Butterfly Valve

48″ Flange Butterfly Valve (C95500 Body, K500 Disc, Metal Seat)

✔ Body Material: Aluminum Bronze (C95500) – Excellent seawater & corrosion resistance
✔ Disc Material: Nickel-Aluminum Bronze (K500) – High strength & wear resistance
✔ Seat: Stainless Steel + Graphite (Fire-Safe)
✔ Size: 48 Inch (DN1200)
✔ Pressure Rating: 150 LB (PN16)

Best For:

• Marine & offshore applications

• Chemical & petrochemical plants

• High-temperature steam systems

4. Why Choose STV’s Triple Eccentric Valves?

✅ API 609, ISO 9001, CE Certified
✅ Custom designs (sizes up to 80″)
✅ Competitive pricing & fast global delivery
✅ 24/7 technical support

📞 Contact STV for a Quote Today!
🌐 www.stvvalves.com
✉ sales@stvvalves.com