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VANESSA Triple Offset Valves – Zero-Leakage Reliability for Critical Process Applications

VANESSA Triple Offset Valves 

Zero-Leakage Reliability for Critical Process Applications


VANESSA, a flagship valve brand under Emerson, represents over 50 years of engineering excellence in triple offset valve (TOV) technology. Designed for bidirectional zero leakage*, friction-free operation, and SIL 3 safety compliance, these valves are the preferred solution for severe service conditions in hydrocarbon storage, chemical processing, power generation, and emergency shutdown systems.

Key Technology Highlights

  1. True Zero-Leakage Performance

    • Metal-to-metal torque sealing ensures bidirectional zero leakage (tested per ISO 5208, EN 12266-1 Leakage Rate A, and API 598 resilient seat standards), eliminating fugitive emissions.

    • Frictionless 90° rotation prevents seat wear, enabling long-term sealing integrity even after thousands of cycles.

  2. Triple Offset Design for Lifetime Reliability

    • Eccentric 1: Axis offset behind the seal face for frictionless opening/closing.

    • Eccentric 2: Axis offset from valve centerline to enable smooth disc movement.

    • Eccentric 3: Conical seat angle倾斜优化 for automatic wedging action – the valve seals tighter as pressure increases.

    • No cavity design prevents media buildup, reducing contamination risks in slurries or corrosive fluids.

  3. Built for Safety and Compliance

    • SIL 3 certified (IEC 61508) for emergency shutdown (ESD) systems in tank farms and hazardous environments.

    • Fire-safe per API 607/ISO 10497: Metal-sealed construction withstands extreme heat with zero leakage during fire events.

    • Emissions compliance: ISO 15848-1 BH certification for low fugitive emissions.

  4. Low Maintenance and High Durability

    • Top-entry design allows in-line maintenance of disc, seat, and bearings without pipeline removal.

    • Extended MTBF (Mean Time Between Failures): No periodic seat replacements; only occasional gland packing adjustment may be needed.

    • Wide temperature range: Standard models from -29°C to +200°C; cryogenic/high-temperature variants available (-40°C to +600°C).

Applications – Trusted in Critical Industries

  • Tank Farm ESD: First tank valve for crude oil, LNG, and volatile hydrocarbons (e.g., Vanessa 30,000 series).

  • Chemical & Pharmaceutical: Corrosive media handling with API 598 zero-leakage assurance.

  • Power Generation: Isolation in FGD systems, cooling water, and ash handling.

  • Water & Wastewater: Abrasive slurry control with cavitation-resistant designs.

Technical Specifications

Parameter Specifications
Size Range DN 50 to DN 1200 (custom sizes available)
Pressure Rating Up to PN 100/Class 600
Standards ISO 5211 mounting, EN 1092, ANSI B16.5, API 609 (Category B)
Actuation Options Manual, pneumatic, electric, hydraulic (ISO 5211 compliant)
Leakage Certification Zero leakage per API 598, ISO 5208 Leakage Rate A

Why Choose VANESSA Triple Offset Valves?

  • Proven Legacy: 300,000+ valves installed globally since the 1980s.

  • Cost-Effective Lifespan: Reduced total cost of ownership (TCO) via minimal maintenance and no seat replacements.

  • Dynamic Safety: Asymmetric disc design enables fail-close or fail-open functionality based on installation direction.

  • Emerson Global Support: Technical service teams and distributors across 70+ countries.

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