Presentation of Rotary (C.B.N.) Unions
The Rotary (C.B.N.) Union is a self contained, self supporting rotary seal for the leak proof transfer of fluids (such as steam, hot water, air or oil to and from rotating machine shafts.
The type of Rotary Seal fitted to the Rotary (C.B.N.) Union is a “FILTON BELLOWS SEAL” containing a flexible stainless steel bellows which is self adjusting ; eliminating the maintenance common with conventional packed glands.
Rotary sealing is created by relative rotation between extremely flat sealing faces (items 2 and 5 ) held in contact by the spring characteristic of the bellows with an additional sealing force created by pressure of the fluid passing through the Rotary (C.B.N.) Union.
The bearings fitted to the Rotary (C.B.N.) Union are separate carbon thrust and journal bearings in which a hard chromed and ground spindle rotates.
There are 3 variations of the stationary Adaptor end described below :
Type C.B.N./B.E. • Type C.B.N./S.T. • Type C.B.N./R.S.
Example : FILTON Rotary (C.B.N.) Unions type B.E.
The components with an asterisk rotate with the machine shaft
Adaptor, s.g. iron.
Bellows sub-assembly brazed stainless steel/carbon.
Gaskets.
Spacer, plated steel.
Seal ring, hardened stainless steel
Locking screw, h.t. steel.
Thrust bearing, carbon.
Journal bearing, carbon.
Body, s.g. iron.
Rotary spindle, steel
Operational Guidelines
Fluids
: Hot water, steam, mineral oils, heat transfer fluids (but use flanged connections when the temperature exceeds 180°C). All fluids should be clean and free from abrasive particles.
Pression : 17 bar maximum.
Temperature : 100°C to 300°C (lower temperatures dependant on other conditions).
Speed : 300 r.p.m. up to 50 (2″) size, 250 r.p.m. for 65 (2½”) and 80 (3″), 200 r.p.m. 90 (3½”) and 100 (4″), and 150 r.p.m. for 125 (5″) and 150 (6″).
| FLOW CAPACITY | ||||
| Nominal Size |
Type | water* m³/h |
steam** kg/h |
Air*** m³/h |
| 40 (1½”) | BE | 10.4 | 381 | 364 |
| ST & RS | 3.8 | 151 | 135 | |
| 50 (2″) | BE | 19.5 | 717 | 684 |
| ST & RS | 6.3 | 357 | 215 | |
| 65 (2½”) | BE | 30.5 | 1120 | 1069 |
| ST & RS | 10.8 | 547 | 376 | |
| 80 (3″) | BE | 41.6 | 1524 | 1455 |
| ST & RS | 14.9 | 807 | 511 | |
| 90 (3½”) | BE | 57.0 | 2091 | 1996 |
| ST & RS | 23.4 | 942 | 818 | |
| 100 (4″) | BE | 76.6 | 2807 | 2679 |
| ST & RS | 27.6 | 982 | 937 | |
| 125 (5″) | BE | 112.2 | 4859 | 4639 |
| ST & RS | 45.3 | 1617 | 1544 | |
| 150 (6″) | BE | 166.3 | 6997 | 6680 |
| ST & RS | 73.7 | 2892 | 2760 | |
| * Flow at a velocity of 3 m/s (applies also to other liquids) ** Flow at a velocity of 30 m/s and a pressure of 6 bar *** Flow at a velocity of 15 m/s and a pressure of 6 bar |
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