“A Winning Combination”

Flex-A-Seal mechanical seals with a Pack-Ryt® bearing/bushing “ORM” O-ring mount design.

This patented design is a proven problem solving solution which addresses two common problems, of radial shaft movement and the need to reduce excessive water flush consumption commonly found in process plants around the world. This design requires no modification to the existing rotating equipment.

The “ORM” bearing/ bushing was developed to provide additional bearing support to centralize and stabilize the rotating shaft in the stuffing box/seal chamber. In addition to this it can significantly reduce the amount of water or flush media going into the sealed product. To achieve this goal a special compression molded proprietary blend of carbon fiber, graphite and thermoplastic material was developed. This material has excellent strength, thermal and chemical resistant properties and is self lubricating. The ORM has moved the typical bushing design which has traditionally, worn out easily, experienced increased leakage and wear on sleeves or shafts to a truly superior bearing design.


Common rotating equipment which has excessive radial shaft movement includes:

Centrifugal pumps:

In a perfect world these pumps would operate exactly as designed and run at their “BEP” Best Efficiency Point. But in the real world the pumps can actually run at the extreme left or right of the BEP of its performance curve. When this happens the shaft will suffer a deflection load between the equipment bearings and impeller. In the area of the mechanical seal this will cause vibration and radial shaft movement which can misalign the rotating and stationary components of the mechanical seal. This leads to fatigue of the mechanical seal components, leakage and ultimate failure of the mechanical seal.

Vertical pumps:

Long slender shafts with little support.

Horizontal split case pumps:

Due to the long over hang between bearings the shaft can sag, particularly in the older pump designs which relied on the packing rings to provide shaft support. This becomes a problem when the pump has been converted to a mechanical seal.

Agitators and mixers:

With long overhung shaft designs top, side and bottom entry.


Flex-A-Seal Advantages:

  • Stabilizing the shaft will increase the MTBF of the rotating equipment by increasing the life of the mechanical seal and bearing.
  • Significantly reduces the volume of water or flushing media into the process. Very important for process plants looking to conserve water consumption.
  • Eliminates the need for a flowmeter which can clog over a period of time, then choking off the flush which will cause the mechanical seal to fail prematurely.
  • Improves the sealing environment for longer mechanical seal life. With the tighter bearing clearance between the ORM and the shaft allows the velocity of the water or flushing media to keep abrasives and solids from entering the stuffing box.
  • Easy Installation; simply slide the ORM down the stuffing box until it contacts the throat of the box. An O-ring on the outside diameter of the ORM will seal the stuffing box bore.
  • Available in solid or split arrangements the split arrangement is ideal when used with the Style 85 split cartridge mechanical seal. This eliminates the time needed to disassemble the equipment.
  • With the self lubricating properties of the ORM material it will not wear the stainless steel shaft or sleeve. This eliminates the need and cost to harden them.


For more information on the Pack-Ryt®


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