Kalsi Seals

745 Park Two Drive
Sugar Land,  TX  77478

United States
  • Booth: 4500

Kalsi Seals are a family of rotary seals that provide hydrodynamic lubrication to minimize seal and shaft wear, and to accommodate high differential pressure. They are used for lubricant retention and contaminant exclusion in oilfield equipment, and in severe service applications in other industries.


  • Hydraulic Swivel Seals
    Hydrodynamic rotary shaft seals for hydraulic swivels seals....

  • Enhanced lubrication seals were developed to lubricate efficiently with low viscosity lubricants, to reduce seal running torque (i.e. seal drag), seal generated heat, and wear in the high differential pressure conditions encountered in applications such as high pressure hydraulic swivels.

    Enhanced Lubrication Seals are available in single durometer, dual durometer, and plastic lined configurations. In the dual durometer and plastic lined configurations, the inner part of the seal has a higher modulus than the outer part of the seal, for improved high pressure extrusion resistance. The dual durometer and plastic lined configurations further reduce breakout and running torque, and seal generated heat, while augmenting extrusion resistance.

    For additional information, visit:


    https://www.kalsi.com/sites/default/files/literature/hydraulic_swivel_seals.pdf  and


  • Mud Motor Seals
    Hydrodynamic rotary shaft seals for sealed bearing mud motors....

  • Sealed bearing mud motors have several rotary seal locations, and all are critical to reliability. A rotary seal in an axially floating pressure compensation piston is used to balance the lubricant pressure to the drillstring bore pressure. A rotary seal in a fixed location is used to withstand the high pressure differential between the lubricant and the well annulus pressure. A rotary seal in an axially floating barrier piston protects the high pressure seal from the drilling fluid. For more information, visit:


    https://www.kalsi.com/handbook/E03_Using_Kalsi_Seals_in_mud_motors.pdf  and

  • Plastic lined Kalsi Seals
    Higher differential pressure and lower breakout torque....

  • Plastic lined Kalsi Seals have a plastic layer at the dynamic interface, and an elastomer energizing section forming the seal body. Radial compression of the elastomer loads the dynamic lip against the shaft. This seal is directed at increasing high pressure sealing capacity and reducing breakout torque. As with other Kalsi-brand rotary seals, our plastic lined seals rely on hydrodynamic interfacial lubrication to minimize the wear of the dynamic sealing surfaces. The significant level of hydrodynamic efficiency that is required to lubricate a plastic seal in high differential pressure conditions is achieved by advanced geometries developed and patented by Kalsi Engineering.

    The use of a plastic liner places a material at the extrusion gap that has a higher modulus of elasticity, compared to elastomers. This increase in modulus promotes high pressure extrusion resistance. The use of a plastic liner also places a material at the shaft that has a lower coefficient of friction than the elastomer that contacts the seal groove. This reduces breakout torque, compared to Kalsi Seals composed entirely of elastomer, and helps to ensure that the seal does not slip within the seal groove.

    For additional information, visit:

    https://www.kalsi.com/handbook/C16_Plastic_lined_Kalsi_Seals.pdf  and


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