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