P.B./R.S. P.B./R.S.

Modèle P.B. Type P.B./R.S.

The elbow fitted to this Rotary (P.B.) Union is suitable for a rotating centre tube, which must be located and driven by the machine. Centre tubes are only provided if ordered.

The centre tube rotates in a labyrinth bush. The centre tube “sealing” system allows a slight internal leakage between the supply and return lines. If these fluids must not mix then an alternative design can be provided, please ask our Technical Department .

Flow can pass-in through the centre tube with the return through the annulus or be reversed

Type P.B./R.S. for double flow rotary centre tube

Nominal
size
A Part No.
15 (½”) G.½” 18468 – R or L
¾”-16 UNF 18468U – R or L
M22 x 1.5 18468MB – R or L
20 (¾”) G.¾” 18471 – R or L
1″-14 UNS 18471U – R or L
M30 x 1.5 18471MB – R or L
25 (1″) G.1″ 18474 – R or L
1½”-12 UNF 18474U – R or L
M35 x 1.5 18474MB – R or L
R, L depend on the direction of rotation

 

Rotary (P.B.) Unions – type R.S. – Dimensions

Nominal
size
B C D E F G H I J K M S T U V
15 (½”) G.½” 13 193 130 29 16 44 68 181 G.¼” 30 9.52/9.50 20 166 38
20 (¾”) G.¾” 18 196 133 32 19 44 68 184 G.¼” 30 12.70/12.67 20 169 38
25 (1″) G.1″ 22 210 148 43 22 52 88 197 G.3/8″ 25 15.87/15.85 25 185 42
Dimensions in millimetres


‘G’ is the designation for parallel pipe threads to BS2779 and ISO 228/1