http://www.drilexpower.com/Power-Sections/Best_Practices.pdf WebA typical mud motor compensation piston The compensation pistons in an oilfield mud motor are shaft guided by a journal bearing relationship with the shaft. This minimizes the compression changes and the lateral sliding motion at the environment-side gland wall that the rotary seal experiences due to lateral shaft movement.

Sealed bearing mud motor design for Kalsi-brand rotary seals

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