FILTON Rotary (R.E.) Unions (ball bearings)
The components with an asterisk rotate with the machine shaft
Example : Rotary (R.E.) Union type S.T.
Adaptor, high quality cast iron.
Bellows sub-assembly, brazed stainless steel.
Gaskets.
Seal ring sub-assembly, steel/carbon.
Locking screw, h.t. steel.
Spacer.
Circlip.
Ball bearings.
Body high quality cast iron.
Rotary spindle, steel.
Centre tube, if ordered, to customers specification.
PPresentation of Rotary (R.E.) Unions
The Rotary (R.E.) Union is a self contained, self supporting rotary seal for the leak proof transfer of fluids (such as steam, water, air or oil) to and from rotating machine shafts.
The type of Rotary Seal fitted to the Rotary (R.E.) 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 4) 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 (R.E.) Union.
The bearings fitted to the Rotary (R.E.) Union are standard ball bearings which are given their initial lubrication before despatch.
There are 3 variations of the stationary Adaptor end described below :
Type R.E./B.E.
This Rotary (R.E.) Union is a single flow unit and is suitable for transferring fluid in to or out of rotating machines.
| Nominal size |
Part No. |
| 8 (¼”) | 14642 – R ou L |
| 10 (3/8″) | 14636 – R ou L |
| 15 (½”) | 14536 – R ou L |
| 20 (¾”) | 14460 – R ou L |
| 25 (1″) | 14396 – R ou L |
| 32 (1¼”) | 14377 – R ou L |
| R, L depend on the direction of rotation | |
| Dimension nominale |
A, B & N | C | D | E | F | G & P | H | I | O | Q | S | T | V | W |
| 8 (¼”) | G.¼” | 6 | 117 | 94 | 22 | 11 | 30 | 57 | M5 x 0.8 | 6 | 4.75/4.72 | 25 | 24 | 44 |
| 10 (3/8″) | G.3/8″ | 10 | 121 | 97 | 25 | 13 | 30 | 57 | M6 x 1.0 | 6 | 6.35/6.32 | 25 | 24 | 44 |
| 15 (½”) | G.½” | 13 | 167 | 130 | 29 | 16 | 44 | 83 | G.1/8″ | 6 | 9.52/9.50 | 40 | 38 | 63 |
| 20 (¾”) | G.¾” | 18 | 173 | 133 | 32 | 19 | 44 | 83 | G.¼” | 10 | 12.70/12.67 | 40 | 38 | 63 |
| 25 (1″) | G.1″ | 22 | 197 | 149 | 48 | 22 | 54 | 105 | G.3/8″ | 10 | 15.87/15.85 | 45 | 43 | 83 |
| 32 (1¼”) | G.1¼” | 30 | 227 | 170 | 51 | 25 | 70 | 121 | G.½” | 13 | 19.05/19.02 | 50 | 58 | 95 |
| Les dimensions sont indiquées en millimètres | ||||||||||||||
‘G’ est l’appellation pour les filetages parallèles (Normes B.S. 2779 et ISO 228/1)
Type R.E./S.T.
This Rotary (R.E.) Union is fitted with an Adaptor suitable for double flow with a stationary centre tube. This gives flow areas through the centre tube and annulus. Centre tubes are only provided if ordered. The centre tube is fixed to the Rotary (R.E.) Union end by means of a screw thread shown as dimension “O“.
Flow can pass in through the centre tube and return through the annulus or be reversed. For steam applications he centre tube is curved to reach the condensate in the bottom of the cylinder. At times the roll neck diameter to length ratio prevents a curved tube being used, in such cases we can provide a Syphon Elbow.
| Nominal size |
Part No. |
| 8 (¼”) | 14643/M – R ou L |
| 10 (3/8″) | 14637/M – R ou L |
| 15 (½”) | 14535 – R ou L |
| 20 (¾”) | 14534 – R ou L |
| 25 (1″) | 14542 – R ou L |
| 32 (1¼”) | 14379 – R ou L |
| R, L depend on the direction of rotation | |
| Dimension nominale |
A, B & N | C | D | E | F | G & P | H | I | O | Q | S | T | V | W |
| 8 (¼”) | G.¼” | 6 | 117 | 94 | 22 | 11 | 30 | 57 | M5 x 0.8 | 6 | 4.75/4.72 | 25 | 24 | 44 |
| 10 (3/8″) | G.3/8″ | 10 | 121 | 97 | 25 | 13 | 30 | 57 | M6 x 1.0 | 6 | 6.35/6.32 | 25 | 24 | 44 |
| 15 (½”) | G.½” | 13 | 167 | 130 | 29 | 16 | 44 | 83 | G.1/8″ | 6 | 9.52/9.50 | 40 | 38 | 63 |
| 20 (¾”) | G.¾” | 18 | 173 | 133 | 32 | 19 | 44 | 83 | G.¼” | 10 | 12.70/12.67 | 40 | 38 | 63 |
| 25 (1″) | G.1″ | 22 | 197 | 149 | 48 | 22 | 54 | 105 | G.3/8″ | 10 | 15.87/15.85 | 45 | 43 | 83 |
| 32 (1¼”) | G.1¼” | 30 | 227 | 170 | 51 | 25 | 70 | 121 | G.½” | 13 | 19.05/19.02 | 50 | 58 | 95 |
| Les dimensions sont indiquées en millimètres | ||||||||||||||
‘G’ est l’appellation pour les filetages parallèles (Normes B.S. 2779 et ISO 228/1)
Type R.E./R.S.
For the type R.E./R.S. the centre tube rotates in a bush. The centre tube “sealing” system allows a slight internal leakage between the supply and return lines. If these fluids must not mix then an alternative design can be provided, please ask our technical departement.
Flow can pass in through the centre tube with the return through the annulus or be reversed.
rotary centre tube
| Nominal size |
Part No. |
| 8 (¼”) | 17196 – R ou L |
| 10 (3/8″) | 17197 – R ou L |
| 15 (½”) | 16657 – R ou L |
| 20 (¾”) | 16659 – R ou L |
| 25 (1″) | 16661 – R ou L |
| 32 (1¼”) | 16663 – R ou L |
| R, L depend on the direction of rotation | |
| Nominal size |
A, B & N | C | D | E | F | G & P | H | I | O | Q | S | T | V | W |
| 8 (¼”) | G.¼” | 6 | 117 | 94 | 22 | 11 | 30 | 57 | M5 x 0.8 | 6 | 4.75/4.72 | 25 | 24 | 44 |
| 10 (3/8″) | G.3/8″ | 10 | 121 | 97 | 25 | 13 | 30 | 57 | M6 x 1.0 | 6 | 6.35/6.32 | 25 | 24 | 44 |
| 15 (½”) | G.½” | 13 | 167 | 130 | 29 | 16 | 44 | 83 | G.1/8″ | 6 | 9.52/9.50 | 40 | 38 | 63 |
| 20 (¾”) | G.¾” | 18 | 173 | 133 | 32 | 19 | 44 | 83 | G.¼” | 10 | 12.70/12.67 | 40 | 38 | 63 |
| 25 (1″) | G.1″ | 22 | 197 | 149 | 48 | 22 | 54 | 105 | G.3/8″ | 10 | 15.87/15.85 | 45 | 43 | 83 |
| 32 (1¼”) | G.1¼” | 30 | 227 | 170 | 51 | 25 | 70 | 121 | G.½” | 13 | 19.05/19.02 | 50 | 58 | 95 |
| Dimensions in millimetres | ||||||||||||||
‘G’ is the designation for parallel pipe threads to BS2779 and ISO 228/1
Operational Guidelines
Fluids : Water, steam, mineral oils and compressed air (lubricated).All fluids should be clean and free from abrasive particles.
Pressure : 17 bar maximum.
Vacuum : 740 mm Hg. maximum
(specify vacuum and we will test for this).
Temperature : -20° to 180°C (with suitable effective lubrication 200°C).
Speed : 1000 r.p.m. maximum up to 25(1 “) r.p.m. and 800 r.p.m. above.
| Flow capacity | ||||
| Nominal size |
Type | Water* m³/h |
Steam** kg/h |
Air*** m³/h |
| 8 (¼”) | BE | 0.3 | 11 | 11 |
| ST & RS | 0.05 | 3.4 | 2 | |
| 10 (3/8″) | BE | 0.8 | 31 | 29 |
| ST & RS | 0.1 | 16 | 4 | |
| 15 (½”) | BE | 1.7 | 61 | 58 |
| ST & RS | 0.3 | 27 | 10 | |
| 20 (¾”) | BE | 2.7 | 101 | 96 |
| ST & RS | 0.6 | 41 | 22 | |
| 25 (1″) | BE | 4.1 | 151 | 144 |
| ST & RS | 1.8 | 56 | 44 | |
| 32 (1¼”) | BE | 7.6 | 280 | 267 |
| ST & RS | 2.1 | 133 | 74 | |
| * 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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It is not advisable to combine maximums
