Cast Steel Trunnion Ball Valve

Features & Advantages

• High Pressure/Temperature Rating: Suitable for classes 150 to 2500 and temperatures from -29°C to 425°C.

• Reduced Torque: Trunnion support lowers friction, easing operation in large sizes (2" to 48").

• Bidirectional Sealing: Reliable shut-off in both flow directions.

• Fire-Safe Design: Metal secondary seals engage if soft seals fail (API 607/6FA compliant).

• Anti-Static Device: Prevents spark risk (API 6D requirement).

Key Components

1. Body: Cast steel (e.g., ASTM A216 WCB) for strength and corrosion resistance.

2. Ball: A solid, rotating sphere with a bore, anchored by trunnion shafts to reduce stress.

3. Trunnion Shafts: Mechanical supports that fix the ball in place, minimizing operational torque.

4. Seats: Ring-shaped seals (PTFE, metal, or composite) for tight shut-off.

5. Stem: Blowout-proof design connects the actuator to the ball.

6. Seals: Fire-safe materials (e.g., graphite) to prevent leakage during extreme conditions.

Applications

• Oil & gas pipelines

• Petrochemical plants

• Power generation

• Water treatment systems

• High-pressure steam services

Standards & Certifications

• API 6D: Pipeline valve specifications.

• ASME B16.34: Pressure-temperature ratings.

• ISO 17292: Industrial valve standards.

Typical Configurations

• End connections: Flanged, butt-weld, or socket weld.

• Actuation: Manual handwheel, gear, pneumatic, or electric.

• Seat options: Soft seats for tight shut-off or metal seats for high temperatures.