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Rotary C.B.N. - High Temperature

(Sizes 1-1/2" to 6")





Maintenance and Overhaul


• Remove bolts and washers (20) which allows for the removal of adaptor (4).

• Remove bellows subassembly and gasket of seal kit (5) and spacer (6). Note that for the 125 (5”) and the 150 (6”), the locking screw (18) will need removing as spacer (16) is screwed RH thread and should be adjusted to give 6mm compression on the bellows subassembly during refitting.

• Remove locking screws (7) from the rubbing ring of seal kit (5) through the bleed port in body S/A (19) and unscrew the rubbing ring (RH or LH thread) and remove the gasket and thrust pad (17).

• Remove spindle (21) from body S/A (19) and check the bore of the carbon bearing and the bearing surface of the spindle for excessive wear.

• If the adaptor (4) is Type R.S., remove locking screw (3), unscrew locking ring (1) and remove C/T bearing (2).

• Replace seal kit (5) and thrust pad (17) at a minimum.

• Replace body S/A (19) and spindle (21) depending on condition. If type RS, replace C/T bearing (2).

• Thoroughly clean all parts before reassembly (which is virtually the reverse of the above steps).

• Handle seal kits with care to avoid damaging the precision lapped seal faces.

• After reassembly, follow the recommended installation procedures and allow for a suitable run-in to period ensure the seals are working correctly before refitting to the machine.


* Note: For the 125 (5”) and 150 (6”) models, there is spacer (16) and
a locking screw (18) which can be adjusted to give 6mm
compression on the bellows subassembly if necessary.



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Other C.B.N. Links

• Description & Dimensions

• Model Numbers

• Part Identification

• Maximum Operating Recommendations

• Flow Capacity

• Installation Procedures

• Maintenance and Overhaul

• Lubrication

• Download C.B.N. Union Manual.pdf


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Typical Applications

Rotary Union Models

•  R.E. (1/4" to 1-1/4")

•  P.B. (1/2" to 1)"

•  C.B. (1/4" to 1-1/4")
High Temperature

•  R.E.B. (1-1/2" to 6")

•  C.B.N. (1-1/2" to 6")
High Temperature)

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