Rotary (R.E.B.) Unions REB/BE REB/ST REB/RS

FILTON Rotary (R.E.B.) Unions

The components with an asterisk rotate with the machine shaft

Example : Rotary (R.E.B.) Union type B.E.
Adaptor, s.g. iron.

Bellows sub-assy, brazed stainless steel/carbon.

Gaskets.

Body, s.g. iron.

Seal ring, hardened stainless steel.

Locking screws, h.t. steel.

Locking ring-inner.

Ball bearings-shielded from the seal chamber.

Locking ring-outer.

Rotary spindle, steel.

Presentation of Rotary (R.E.B.) Unions

The Rotary (R.E.B.) 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.B.) 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 4 and 5) held in contact by the spring characteristics of the bellows with an additional sealing force created by pressure of the fluid passing through the Rotary (R.E.B.) Union.

The bearings fitted to the Rotary (R.E.B.) Union are standard ball bearings which are given their initial lubrication after assembly. A shield is fitted to the seal chamber side of the ball bearings.
There are 3 variations of the stationary Adaptor end described below :

Type R.E.B./B.E.
This is a single flow unit and is suitable for transferring fluid in to or out of rotating machines.
Click here to see a typical application for this type.

Type R.E.B./B.E. for single flow

Nominal
size
Part No.
40 (1½”) 18104 – R ou L
50 (2″) 17350 – R ou L
65 (2½”) 18131 – R ou L
80 (3″) 17265 – R ou L
90 (3½”) 17421 – R ou L
100 (4″) 17424 – R ou L
125 (5″) 17634.SF – R ou L
150 (6″) 17637.SF – R ou L
R, L depend on the direction of rotation

 

Rotary (R.E.B.) Unions – Dimensions

Nominal
size
A B & N C D E F G & P H I O Q S* T V W
40 (1½”) G.1½” G.1½” 35 268 212 52 25 72 128 G.¾” 14 25.4,f8 50 64 108
50 (2″) G.2″ G.2″ 48 293 226 55 28 83 137 G.1″ 19 31.8,f8 60 76 127
65 (2½”) G.2½” G.2½” 57 357 279 67 30 102 186 G.1¼” 25 40,f8 55 90 150
80 (3″) G.3″ G.3″ 70 409 324 77 30 120 200 G.1½” 25 45,f8 70 110 180
90 (3½”) G.3½” G.4″ 82 519 406 95 40 130 250 G.2″ 30 60,f8 60 140 240
100 (4″) G.4″ G.4″ 95 519 406 95 40 130 250 G.2½” 30 75,f8 60 140 240
125 (5″) flanged G.5″ 115 688 543 115 45 167 325 G.3″ 40 88,f8 70 192 290
150 (6″) flanged G.6″ 140 688 543 115 45 167 325 G.3½” 40 100,f8 70 192 290
Dimensions in millimetres


‘G’ is the designation for parallel pipe threads to BS2779 and ISO 228/1
*the tolerance f8 is to ISO 286-2 and BS.EN 20286-2

Type R.E.B./S.T.

This Rotary (R.E.B.) 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.B.) 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 le the 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.

Type R.E.B./S.T. for double flow
stationary centre tube

Nominal
size
Part No.
40 (1½”) 18106 – R ou L
50 (2″) 17351 – R ou L
65 (2½”) 18133 – R ou L
80 (3″) 17263 – R ou L
90 (3½”) 17423 – R ou L
100 (4″) 17426 – R ou L
125 (5″) 17636.SF – R ou L
150 (6″) 17639.SF – R ou L
R, L depend on the direction of rotation

 

Rotary (R.E.B.) Unions – Dimensions

Nominal
size
A B & N C D E F G & P H I O Q S* T V W
40 (1½”) G.1½” G.1½” 35 268 212 52 25 72 128 G.¾” 14 25.4,f8 50 64 108
50 (2″) G.2″ G.2″ 48 293 226 55 28 83 137 G.1″ 19 31.8,f8 60 76 127
65 (2½”) G.2½” G.2½” 57 357 279 67 30 102 186 G.1¼” 25 40,f8 55 90 150
80 (3″) G.3″ G.3″ 70 409 324 77 30 120 200 G.1½” 25 45,f8 70 110 180
90 (3½”) G.3½” G.4″ 82 519 406 95 40 130 250 G.2″ 30 60,f8 60 140 240
100 (4″) G.4″ G.4″ 95 519 406 95 40 130 250 G.2½” 30 75,f8 60 140 240
125 (5″) flanged G.5″ 115 688 543 115 45 167 325 G.3″ 40 88,f8 70 192 290
150 (6″) flanged G.6″ 140 688 543 115 45 167 325 G.3½” 40 100,f8 70 192 290
Dimensions in millimetres


‘G’ is the designation for parallel pipe threads to BS2779 and ISO 228/1
*the tolerance f8 is to ISO 286-2 and BS.EN 20286-2

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°C to 180°C maximum (with suitable effective lubrication 200°C).
-20°C to 120°C for sizes 125 (5″) and 150 (6″).

Speed : 600 r.p.m. maximum up to 50 (2″) size, 500 r.p.m. for 65 (21/2′) and 80 (3″) 400 r.p.m. for 90 (31/2″) and 100 (4″) and 300 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


It is not advisable to combine maximums

C