Type I.N.T. I.N.T.

Presentation of Rotary (I.N.T.) Unions

The Rotary (I.N.T.) Union is for use where there is a space limitation between the roll end and the machine frame.
The end of the roll is bored out to accept this self-contained unit. The Rotary Seal fitted is a Filton Bellows Seal which is identical to the seals fitted in the Rotary (R.E.) Union, an alternative Filton Mechanical seal is available for higher pressures and speeds.
The rotary parts of the Rotary (I.N.T.) Union are held in position by a clamping ring which is part of the roll end design. The services must be connected with flexible hose.

There are two variations of the stationary spindle end described below :
Type I.N.T./B.E. • Type I.N.T./S.T.

Example : Rotary (I.N.T.) Union type B.E.

The components with an asterisk rotate with the machine shaft

Body, plated steel.

Bellows sub-assembly, brazed stainless steel.


Seal ring sub-assembly, steel/carbon.

Locking screw, h.t. steel.


Circlip, spring steel.

Ball bearings.

‘O’ Ring seal, nitrite rubber.

Spindle, steel.

Locking ring, steel.


Operational Guidelines

Fluids : Using a Filton Bellows Seal, water and steam. Using a Filton Mechanical Seal, compressed air (lubricated) and oil. All fluids should be clean and free from abrasive particles.

Pressure : 17 bar maximum, for the Filton Bellows Seal ; 34 bar maximum for the Filton Mechanical Seal.

Temperature : -20°C to 140°C.

Speed : 1000 r.p.m. maximum for the Filton Bellows Seal ; 1500 r.p.m. maximum for the Filton Mechanical Seal.

Flow capacity
Type Water*
8 (¼”) BE 0.3 11 11
ST 0.05 3.4 2
10 (3/8″) BE 0.8 31 29
ST 0.1 16 4
15 (½”) BE 1.7 61 58
ST 0.3 27 10
20 (¾”) BE 2.7 101 96
ST 0.6 41 22
25 (1″) BE 4.1 151 144
ST 1.8 56 44
* 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