Double Flanged Double Offset Butterfly Valve
Resistant
Sealing
Operation
Long Life
Alis Valves is a trusted Double Flanged Double Offset Butterfly Valve Manufacturer & Supplier in India, offering high-performance butterfly valves for medium to high-pressure industrial applications. Designed with a robust double flanged body and double offset disc geometry, these valves provide reliable shut-off, reduced seat wear, low operating torque, and long service life for oil & gas, petrochemical, power generation, water treatment, chemical processing, and industrial process systems.
Specifications
Size Range
DN50 to DN500 (2" to 20")
Body Material
Ductile Iron, Carbon Steel (WCB), SS304, SS316, Duplex Stainless Steel
Seat Material
PTFE, RPTFE, EPDM, NBR, Metal Seat (Optional)
Temperature Range
-20°C to +250°C (Up to +550°C with Metal Seat)
Design Standards
API 609, ASME B16.34, ISO 5211
Pressure Rating
PN10, PN16, PN25, PN40 / ANSI Class 150 & 300
Disc Material
SS304, SS316, Duplex Stainless Steel
Flange Standard
ASME B16.5, EN 1092-1, IS, JIS (As Required)
Leakage Class
API 598 / ISO 5208
Product Images
Frequently Ask Questions
It is a double-flanged butterfly valve incorporating two shaft/disc offsets to reduce seat friction and operating torque while providing reliable shut-off.
In a concentric butterfly valve, the shaft and disc are centered in the sealing arrangement. A double-offset valve uses eccentric geometry, allowing the disc to disengage from the seat earlier during opening and reducing rubbing and wear.
Alis Valves manufactures and supplies Double Flanged Double Offset Butterfly Valves for water treatment, wastewater, oil & gas, chemical, power, HVAC, petrochemical and other industrial applications.
The first offset moves the shaft away from the centerline of the valve body, while the second offset moves the shaft relative to the sealing axis. This allows the disc to move away from the seat quickly during opening.
Soft-seated double-offset designs can be configured for bi-directional tight shut-off. Metal-seated versions may have a defined preferred flow direction depending on their seat design.
