Double Eccentric Resilient Seated Butterfly Valve

With the double offset design, the disc moves away from the seat quickly when opening. This helps reduce friction on the sealing surface. When closing, the disc presses against the resilient seat to achieve sealing through slight deformation. In practice, this design tends to last longer than concentric butterfly valves and usually requires less operating torque.

The seat material can be EPDM or VITON, depending on the working medium. For clean water, wastewater, or mildly corrosive fluids, this kind of soft seal is generally sufficient. For higher temperature or more aggressive media, a metal seated design is normally considered instead.

Body and disc materials can be selected based on project requirements. Common options include ductile iron, carbon steel, and stainless steel. The stem is typically made from stainless or heat-treated steel to ensure basic strength and wear resistance.

For handling and installation, the valve body is designed with support feet and lifting lugs. This is especially useful for larger sizes. The flanged connection is standard and fits most pipeline systems.

Size Range: DN150–DN1400 (2”–56”) 
Pressure Rating: PN6–PN40 / Class 150 
Temperature Range: -40°C to 125°C (depending on materials) 
Connection: Flanged 
Typical Materials: 
Body: GGG40 / GGG45 / WCB 
Disc: Ductile iron, CF8, CF8M 
Seat: EPDM / VITON 
Stem: F6A, F304, F316, 17-4PH 
Standards: 
API 609 
EN 558-1 
API 598