A trunnion-mounted ball valve designed for fail-safe emergency isolation in critical pipelines. It integrates a mechanical trunnion support system (anchoring the ball at top and bottom) with rapid-acting actuation to ensure immediate shut-off during emergencies (e.g., leaks, overpressure, or fire).
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Key Features:
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Trunnion Design:
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Dual stem support reduces operating torque and seals reliably under high differential pressure (API 6D Class 150–2500).
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Blowout-proof stem prevents stem ejection under extreme conditions.
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Emergency Shut-off (ESD) Function:
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Spring-return or pneumatic/hydraulic actuator for Fail-Close (FC) operation (per IEC 61508 SIL2/SIL3).
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Fire-safe construction (API 607/ISO 10497 certified) with secondary metal seals.
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Applications:
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Oil & gas pipelines.
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Chemical plants (hazardous fluid isolation).
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LNG terminals (cryogenic service to -196°C).
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Technical Specifications:
| Parameter | Detail |
|---|---|
| Size | 4", 8" |
| Pressure | Class 1500LB |
| Actuation | Pneumatic (single/double-acting) |
| Seat Test | Zero leakage per API 598 (bubble-tight shutoff). |
| End Connections | Flanged Raise Face. |
Operational Advantages:
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Fast Closure: ≤2 seconds for full bore shut-off (critical for ESD systems).
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Low Torque: Trunnion design cuts torque by 30–50% vs. floating ball valves.
