Double Eccentric Flanged Butterfly Valve Technical Specifications
Design Evolution
This advanced valve design incorporates dual-axis offset geometry to significantly enhance performance beyond conventional butterfly valves. The innovative configuration delivers:
60-80% reduction in operational torque
Extended service intervals (3-5× standard valve lifespan)
Reliable performance in extreme conditions (600°C/PN40)
Engineering Advantages
Offset Geometry
Primary offset: Valve stem displaced from disc center, creating mechanical advantage
Secondary offset: 5-15° stem inclination enabling frictionless initial rotation
Flange Integration
Standardized flange faces (ANSI/GB/JIS)
Bolted connection with pressure-adaptive gaskets:
High-temp: Spiral-wound metal/graphite
Corrosive media: PTFE-encapsulated
Sealing Technology
Hard Seal Option:
Disc edge: Stellite 6 overlay (HRC 58-62)
Seat: 316L + flexible graphite matrix
Soft Seal Option:
EPDM/PTFE for pharmaceutical/food grade applications
Bubble-tight shutoff (ANSI Class VI)
Performance Validation
100,000-cycle endurance testing (MSS SP-67)
Fugitive emissions <50ppm (ISO 15848-1)
Fire-safe certification (API 607/ISO 10497)
Typical Service Applications
Power plant SO₂ scrubber isolation
Delayed coker unit quench systems
Blast furnace gas recovery circuits
LNG terminal emergency shutdown lines
Comparative Benefits
| Feature | Standard Valve | Double Eccentric |
|---|---|---|
| Torque Requirement | 100% | 40-60% |
| Maintenance Cycle | Annual | 3-5 year |
| Temperature Range | -20~300°C | -196~600°C |
The design's reliability stems from finite element analysis-optimized stress distribution and proprietary surface hardening treatments. Optional smart positioner integration available for Industry 4.0 applications.
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