Flanged Double Offset Butterfly Valve

ALIS Valves offers Flanged Double Offset Butterfly Valves for industrial applications requiring reliable flow isolation, efficient operation and durable performance under demanding process conditions. These valves feature a double-offset design in which the shaft is positioned away from the disc centre and the sealing axis, helping reduce friction between the disc and seat during opening and closing. This arrangement supports smoother operation, minimizes seat wear compared with conventional concentric butterfly valves and helps maintain consistent sealing performance over repeated operating cycles. The flanged body provides bolted connections to compatible pipeline flanges, supporting secure installation and alignment within industrial piping systems. Depending on the specified design, these valves can be configured with resilient or other suitable seating arrangements, appropriate body and disc materials, and manual, pneumatic or electric actuators to meet different operating requirements.

Flanged Double Offset Butterfly Valves are used in water treatment plants, oil and gas facilities, chemical processing units, power generation plants, HVAC systems and general industrial pipeline installations. Depending on the selected materials, pressure rating and seat configuration, they can be specified for compatible liquids, gases and other process media within their rated operating limits. Important selection factors include valve size, flange standard, pressure class, operating temperature, process media, body and disc materials, seat design, required leakage performance and operating torque. The double-offset mechanism can help reduce sealing-surface wear, while the selected seat material determines the valve’s suitability for particular temperatures and media. For automated applications, actuator sizing and control system compatibility should also be evaluated. Selecting the appropriate valve configuration helps support dependable shut-off, efficient operation and reliable service throughout the intended operating range.