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 | ||
| 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
