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Nuraseal Sealing Products  |  Filton® Rotary Union Products

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Rotary P.B. Union

(Sizes 1/2" to 1")

 

 

   

Note: (*) Rotates with the shaft.

 

1. Elbow, brass   2. Bellows sub-assembly, brazed stainless steel
3. Gaskets   4. Seal ring sub-assembly, steel/carbon   5. Locking screw, h.t. steel
6. Spacer   7. Circlip   8. Ball bearings   9. Body, dzr brass   10. Locking ring
11. Rotary Spindle, steel   12. Centre tube (if ordered)

 

Model Shown

Type S.T. fitted with a Bellows Seal.

Mechanical seals are also available (add MS to the Part Number)

 

Description

The rotary P.B. union has been developed from the rotary R.E. union and utilizes the same well-proven and highly successful bellows seal and bearing system. The body is manufactured from de-zincification resistant brass which has advantages over conventional brass and the cast iron adapter of the rotary R.E. union, especially for water cooling applications. 

 

Variations of the Stationary Adapter End

There are three variations available:

 

1) Type B.E. - Single Flow
A single flow union suitable for transferring fluid in to or out of rotating machines. The body is fitted with a plug at the outboard end which allows this type to be converted to a type S.T. or R.S. by using the appropriate elbow.

 

   

2) Type S.T. - Double Flow (Stationary Center Tube)
Fitted with an elbow suitable for double flow with a stationary center tube. This gives flow areas through the center tube and annulus. The center tube - provided only if ordered - is fixed to the union end by means of a screw thread (dimension “O”). Flow can pass in through the center tube and return through the annulus or be reversed. For steam applications, the center tube is curved to reach the condensate in the bottom of the cylinder. If the roll neck diameter to length ratio prevents the use of a curved tube, a syphon elbow can be specified instead. See the Accessory Section or contact us for more information about the options available.

 

 

 

3) Type R.S. - Double Flow (Rotary Center Tube)
Fitted with an elbow suitable for a rotating center tube (which must be located and driven by the machine). The center tube - provided only if ordered - rotates in a labyrinth bush. Flow can pass in through the center tube and return through the annulus or be reversed. The center tube “sealing” system allows for a slight internal leakage between the supply and return lines. If these fluids must not mix, alternate designs are available.

 

 

    

Other P.B. Links

• Description & Dimensions

• Model Numbers

• Part Identification

• Maximum Operating Recommendations

• Flow Capacity

• Installation Procedures

• Maintenance and Overhaul

• Lubrication

• Download P.B. Union Manual.pdf

 

Other Filton® Links

 Home

Filton® Main Menu

Intro to Rotary Unions

Typical Applications

Rotary Union Models

•  R.E. (1/4" to 1-1/4")

•  P.B. (1/2" to 1)"

•  C.B. (1/4" to 1-1/4")
High Temperature

•  R.E.B. (1-1/2" to 6")

•  C.B.N. (1-1/2" to 6")
High Temperature)

Other Models

Special Models

Special Connections

•  Screw Threads

•  Flanges

Accessories

•  Syphon Elbows

•  Flexible Hoses

Also Available from Filton®

Quick Selection Guide

Part Numbers & Cross References

About Filton Ltd.

Health and Safety  

 

 

Model Dimensions
 

NOMINAL

SIZE

ROTARY P.B. UNION - Model Dimensions

A (i)

B

C

D

E

F

G

H

I
B.E. S.T. R.S.

15 (1/2")

G.1/2"

G.1/2"

13 159 193 193 130 26 16 44 68

3/4" - 16UNF

G.1/2"

13 159 193 193 130 26 16 44 68

M22 x 1.5

G.1/2"

13 159 193 193 130 26 16 44 68

20 (3/4")

G.3/4"

G.3/4"

18 162 196 196 133 32 19 44 68

1" - 14UNS

G.3/4"

18 162 196 196 133 32 19 44 68

M30 x 1.5

G.3/4"

18 162 196 196 133 32 19 44 68

25 (1")

G. 1")

G.1"

22 180 210 210 148 43 22 52 88

1-1/2" - 12UNF

G.1"

22 180 210 210 148 43 22 52 88

M35 x 1.5

G.1"

22 180 210 210 148 43 22 52 88

  Note:  (i) "G" is the designation for parallel pipe threads to BS.2779 and ISO 228/1.   

  

NOMINAL

SIZE

ROTARY P.B. UNION - Model Dimensions

J

K

M

O

Q

S

T

U

V

B.E.

S.T.

R.S

15 (1/2")

181

G. 1/4"

30

G. 1/8"

12

9.52 / 9.50

20

--

173

166

38

181

G. 1/4"

30

G. 1/8"

12

9.52 / 9.50

20

--

173

166

38

181

G. 1/4"

30

G. 1/8"

12

9.52 / 9.50

20

--

173

166

38

20 (3/4")

184

G. 1/4"

30

G. 1/4"

12

12.70 / 12.67

20

--

176

169

38

184

G. 1/4"

30

G. 1/4"

12

12.70 / 12.67

20

--

176

169

38

184

G. 1/4"

30

G. 1/4"

12

12.70 / 12.67

20

--

176

169

38

25 (1")

197

G. 3/8"

25

G. 3/8"

9.5

15.87 / 15.85

25

--

185

185

42

197

G. 3/8"

25

G. 3/8"

9.5

15.87 / 15.85

25

--

185

185

42

197

G. 3/8"

25

G. 3/8"

9.5

15.87 / 15.85

25

--

185

185

42

 

   

 

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