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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.
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