BDRP™ Rotary Shaft Seal Sizes

BDRP-brand rotary shaft seals are designed to operate hydrodynamically when differential pressure acts in either axial direction, with relative rotation occuring in either circumferential direction. The seals have been tested with a differential pressure of 1,000 psi (6.89 MPa) at a surface speed of 466 feet per minute (2.37 m/s). The ability to operate hydrodynamically regardless of pressure direction makes these seals a candidate to be used as a rotary control device seal (RCD seal) or as a hydraulic swivel seal.

BDRP seals incorporate an elastomer seal body that is lined with a plastic layer that improves extrusion resistance. When installed, the compressed elastomer layer loads the plastic layer against the shaft, to initiate sealing. Unlike our KLS-brand rotary seals, the hydrodynamic wave geometry of the BDRP seal engages that shaft even in the absence of differential pressure. This means the hydrodynamic pumping related leakage of a BDRP seal will be higher than a KLS seal in low differential pressure conditions. This hydrodynamic leakage occurs only during rotation.

Like the KLS-brand rotary seals, when a BDRP seal is used as an RCD seal, it should be protected from abrasives by an outboard lip seal, with lubricant between the seals pressure-balanced to the pressurized drilling fluid.

Contact us to discuss implementing BDRP seals in your rotary shaft seal assembly. Additional sizes can be furnished, subject to a one-time tooling charge to help to defray associated engineering, machining and set-up expenses. Purchase orders and requests for BDRP high pressure seal quotes should be sent to the attention of Seal Sales via fax at 281-240-0255, or e-mail.

Seal diameter Seal Part Number* Seal Radial Depth D (inches)
Seal Axial Width (inches)
Gland Depth R (inches)**
Gland Width (inches)
-0.000″ +0.005″**
4.500″ 114.30 mm 717-2-* 0.415 ±.005 0.235 0.379 0.300
10.490″ 266.45 mm 717-1-* 0.450 ±.005 0.235 0.422 0.300
  • To view the current rotary seal implementation guidelines (Kalsi Seals Handbook) in PDF format, click here.

* The complete seal part number consists of the basic part number plus the material dash number (-303 or -318). Actual diameter varies as a function of material selected. New tooling may be required for certain materials.
** For gland details, see Chapter D5 of the Kalsi Seals Handbook.


Updated: December 12, 2018

Kalsi-brand rotary shaft seals are offered for sale under the terms and conditions of the “Offer of Sale” that is included in the current revision of the Kalsi Seals Handbook.