Sealed bearing prevents valves from malfunction

Bearing failures are the highest root cause of failure in Triple Offset Butterfly Valves (TOV). This issue is directly attributed to the need to have metal bearings with very tight tolerances when accepting the shaft diameter. Properly designed TOVs are metal to metal torque seated type of valves. Therefore, very little shaft deflection can be tolerated in order to properly torque the seal ring into the seat. Additionally, properly designed TOVs should have the bearings located as close as possible to the center line of the disc, which helps to deliver a rigid support of the shaft when torqueing into the seat.