Presentation of Rotary (P.N.) Unions
The Rotary (P.N.) Union has the same basic design as the Rotary (L.C.) Union but incorporates an oil lubrication reservoir for seal face lubrication.
This unit is intended for use on pneumatic applications where the compressed air is dry. This unit may also be advantageous compared to the Rotary (L.C.) Union even on lubricated air systems where speeds are high and only occasional pneumatic cycles are in use. Under these conditions very little lubricant reaches the seal faces and is quickly dissipated by the seal face temperatures created by natural friction.
Pneumatic applications are, in the main, single flow consequently only this type is offered. Should your application require double flow, please contact our Technical Department.
Rotary (P.N.) Union
The components with an asterisk rotate with the machine shaft
Body.
Mechanical seal assembly.
Seal face lubricator.
Oil reservoir.
Ball bearing – life lubricated.
Rotary spindle.
Rotary (P.N.) Union
| Nominal size |
A | Part No. |
| 8 (¼”) | G.¼” | 18400 – R or L |
| ½” – 20 UNF | 18400U – R or L | |
| M12 x 1.25 | 18400MB – R or L | |
| 10 (3/8″) | G.3/8″ | 18401 – R or L |
| 5/8″ – 18 UNF | 18401U – R or L | |
| M15 x 1.5 | 18401MB – R or L | |
| 15 (½”) | G.½” | 18402 – R or L |
| ¾” – 16 UNF | 18402U – R or L | |
| M22 x 1.5 | 18402MB – R or L | |
| 20 (¾”) | G.¾” | 18403 – R or L |
| 1″ – 14 UNS | 18403U – R or L | |
| M30 x 1.5 | 18403MB – R or L | |
| R, L depend on the direction of rotation | ||
| Nominal size |
B | C | D | E | F | G | I | V | ||||||
| 8 (¼”) | R.¼” | 6 | 90 | 78 | 24 | 11 | 40 | 24 | ||||||
| 10 (3/8″) | R.3/8″ | 10 | 99 | 82 | 26 | 13 | 40 | 24 | ||||||
| 15 (½”) | R.½” | 13 | 127 | 107 | 32 | 16 | 65 | 38 | ||||||
| 20 (¾”) | R.¾” | 16 | 130 | 110 | 35 | 19 | 65 | 38 | ||||||
| Dimensions in millimetres | ||||||||||||||
‘G’ is the designation for parallel pipe threads to BS2779 and ISO 228/1
Operational Guidelines
Fluids : Compressed Air.
Pressure : 10 bar maximum.
Vacuum : 740 mm Hg maximum.
Temperature : 5°C to 75°C.
Speed : 2500 r.p.m. maximum.
