The 578 Butterfly valve from Georg Fischer has all the innovative designs aspects our butterfly valve line is known for but now available in a lug style body. The new valve is ideal when end of line service is required. With the double eccentric valve principal, variety of wetted materials, and a comprehensive actuation package, it is the most versatile plastic butterfly valve on the market.
The Double Eccentric Operating Principal
Unlike most traditional valves, our valve does not use a thick rubber boot for the disc and flange seal. The 578 valve has an off center disc and shaft that disengages the disc from the body during operation. Since the disc is not in contact with the disc seal when opening and closing, there is significantly less wear on the valve parts.
Another result of the double eccentric design is reduced torque. Over time, traditional boot style valves have a tendency to become harder to operate which is troublesome for maintenance and operation personnel. The increased torque can also cause electric actuators to fail prematurely. Even when comparing new valves, our design requires approximately 50% less torque.