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Sealed bearing prevents valves from malfunction

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Publication Form: Fachartikel
Article No.: 30285_2012_SP1_10
Issue: Special 1
Issue Name: Sealed bearing prevents valves from malfunction
Publication Date: 30.09.2012
Author: Dave Buse/Daniel Zwick
Publication House: Vulkan-Verlag GmbH
Pages: 3
Publication Form: PDF
Language: en
Topic: Industriearmaturen


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.

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