Structural Features & Working Principle
1. Double Eccentric Design
First Eccentricity: The valve stem axis is offset from the disc center, reducing friction during opening/closing and minimizing wear on the sealing surfaces.
Second Eccentricity: The disc center is offset from the sealing seat's center, creating a "progressive contact" seal. As the disc rotates (90° travel), it first disengages from the seat, then moves parallel to the seat surface, eliminating rubbing and ensuring tight sealing under low torque.
2.Advantages
1. Superior Sealing Performance
Double eccentricity eliminates seat-disc rubbing, achieving bubble-tight sealing (zero leakage) in both directions, even at low pressures (e.g., ≤0.1 MPa).
Elastomeric seats provide excellent sealing for clean fluids; metal seats suit dusty or slightly abrasive media.
2. Low Operating Torque
Reduced friction from the eccentric design cuts opening/closing torque by 30–50% compared to single-eccentric or concentric valves, enabling smaller actuators and energy savings.
3. Durability & Longevity
Cast iron body resists corrosion in non-acidic environments, while the disc-seat design minimizes wear, extending service life to 100,000+ cycles. 4. Compact & Lightweight
Wafer or flanged design (shorter face-to-face length than gate/globe valves) saves space and reduces installation costs.
Applications
• Municipal Water & Wastewater: Isolation and regulation in pipelines, pump stations, and treatment plants.
• Industrial Processes: Control of air, steam, and non-corrosive liquids in HVAC, food processing, and light industrial systems.
• Power Generation: Cooling water systems and condensate lines in thermal power plants.
• Marine Engineering: Ballast water and seawater systems (with corrosion-resistant coatings). Technical Specifications
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