Unbonded Post-Tensioning System
Technical data of the hydraulic drive units for jacks
| hydraulic drive unit | Type | ZPH1/5 | 77-159 | 77-159 | R 3.0 | R 6.4 |
| till 1990 | from 1990 | |||||
| height | cm | 190 | 44 | 48 | 390 | 450 |
| width | cm | 50 | 38 | 38 | 750 | 980 |
| length | cm | 609 | 41 | 42 | 600 | 850 |
| weight (without oil) | kg | 35 | 49 | 50 | 84 | 185 |
| number of jack connections | 1 | 1 | 1 | 1 | ||
| capacity, oil volume | l/min | 1.6/10cm3/stroke | 1.5/3.0 | 3 | 3 | 6.4 |
| effective oil quantity | l | 5 | 10 | 10 | 13 | 70 |
| operating pressure, max. | ||||||
| - permanent | bar | 800 | 500 | 500 | 600 | 600 |
| - temporary | bar | 600 | 600 | |||
| supply voltage | V/Hz | manual control | 380/50 | 400/50 | 380 | 380 |
| connected load | kW | 3 or 2 | 3 | 2.5 | 7.5 |