Vickers Hydrokraft TVW Piston Pumps
The Vickers by Danfoss Hydrokraft TVW series are variable-displacement, closed-circuit (transmission) axial piston pumps of swashplate design, built for reliable operation and long service life. The range was previously marketed as Eaton Hydrokraft; it is now supplied under the Vickers by Danfoss brand, following Danfoss’s 2021 acquisition of Eaton’s hydraulics business.
TVW pumps are designed for closed-loop hydrostatic transmission circuits, with an integrated charge and flushing circuit built around the basic pump. Rotating and pressure-loaded parts are pressure-balanced for greater efficiency and serviceability, and oversized shafts and bearings support extended bearing life. A thru-drive option allows a second pump to be mounted from the same shaft, and individual pump sections can be paired to form combination (tandem) units.
The series is available in six displacement sizes from 130 to 750 cm³/rev, each with an integrated charge pump and pilot pump sized to the unit. Standard transmission circuits with integrated valves and filters are available to build a complete closed-loop system for charge flow and flushing, and case or bearing flushing is recommended for continuous high-speed, high-pressure duty or for extended low-pressure, low-flow operation.
In addition to standard mineral hydraulic oils, TVW pumps are rated for use with water glycol, phosphate ester and other fire-resistant or synthetic fluids, subject to seal material selection and, in some cases, reduced maximum speed and bearing life; see Fluid Compatibility below. ATEX/UKEX-certified variants are also available for installation in classified hazardous areas.
Key Specifications
| Specification | Detail |
| Technology | Axial piston, swashplate design, closed-circuit (transmission) |
| Displacement range | 130 to 750 cm³/rev (7.9 to 45.8 in³/rev) |
| Models | 130, 180, 250, 360, 500, 750 |
| Rated pressure (100% duty cycle) | 350 bar (5,075 psi) |
| Maximum pressure (to ISO 5598:2008) | 420 bar (6,090 psi) |
| Rated speed | Up to 1800 rev/min (130 to 500 sizes); 750 size rated to 1500 rev/min, or 1800 rev/min with displacement reduced to 625 cm³/rev |
| Direction of rotation | Clockwise or counter-clockwise |
| Mounting | Flange or foot-mounted; combination (tandem) units foot-mounted only |
| Ambient temperature range | -20 to +50°C (-4 to +122°F) |
| Hydraulic fluid temperature range | -25 to +90°C (-13 to +194°F) |
| Viscosity range (continuous operation) | 10 to 75 cSt |
| Maximum permissible start viscosity | 1000 cSt |
| Fluid cleanliness | ISO 4406 18/15/13 or better |
| Hydraulic fluid | Mineral oil to DIN 51524 part 2; alternative fluids available, see Fluid Compatibility below |
| Thru-drive | Available in SAE A, B or C options, enabling multiple pump installations from a single shaft |
| Combination units | Maximum driving torque (ISO splined shaft only): 870/1204 Nm per unit (130/180), 1670 Nm (250), 2405 Nm (360), 5000 Nm (500 and 750) |
Mass, Torque, Power and Charge Pump by Model
| Model | Displacement (cm³/rev) | Mass (kg) | Driving torque at 350 bar, 1500 rev/min (Nm) | Power consumption at 350 bar, 1500 rev/min (kW) | Charge pump displacement (cm³/rev) |
| 130 / 180 | 130 / 180 | 130 / 140 | 724 / 1002 | 113 / 157 | 40 / 40 |
| 250 | 250 | 212 | 1392 | 218 | 64 |
| 360 | 360 | 220 | 2005 | 315 | 80 |
| 500 | 500 | 340 | 2785 | 437 | 125 |
| 750 | 750 (625 at 1800 rev/min) | 395 | 3481 / 4177 | 546 / 656 | 200 |
Control Options
The TVW series offers the following displacement control options. Maximum pump flow can be limited mechanically to between 50% and 100% by a screw on all control types.
SP – Electrohydraulic proportional control
Displacement is set electrically via a proportional valve and servo piston acting on the swashplate, with electrical swashplate angle feedback. Hysteresis is approximately 1% of end value. Can be combined with hydromechanical pressure and/or power limitation. Response time (0 to 100% displacement at 1500 rev/min) ranges from approximately 450 ms (130/180 sizes) to 850 ms (750 size).
DP – Pilot-pressure proportional control
Pump output flow is proportional to a separate pilot pressure signal. No feedback signal is required, though an optical position indicator is recommended. Can be combined with hydromechanical pressure and/or power limitation. Response time (0 to 100% displacement at 1500 rev/min) ranges from approximately 1100 ms (130/180 sizes) to 1600 ms (360 and 750 sizes).
ES – Electric motor control
Displacement is adjusted via a 3-phase electric servo-motor and worm gear, with 4 or 8 limit switches or a potentiometer for position monitoring. Available to special order only; no pressure or power limiter option. Response time from zero to maximum displacement ranges from approximately 5 to 70 seconds depending on pump size, motor type and supply voltage.
Fluid Compatibility
Where an alternative fluid is used, maximum speed and expected bearing life may be reduced depending on pump size, as set out below.
| Fluid type | Classification | Rated pressure | Maximum speed | Seal material | Max. temperature | Bearing life |
| Water glycol | HFC | 250 bar | 1250 to 1800 rev/min depending on size | NBR | 45°C | 25 to 100% of standard bearing life |
| Phosphate ester | HFDR | 350 bar | 1000 to 1500 rev/min depending on size | FKM | 60°C | 100% of standard bearing life |
| Glycol-based fire-resistant | HFDU | 350 bar | 1000 to 1500 rev/min depending on size | FKM | 60°C | 100% of standard bearing life |
| Ester-based fire-resistant | HFDU | 350 bar | 1250 to 1800 rev/min depending on size | FKM | 60°C | 100% of standard bearing life |
| Synthetic ester | HEES | 350 bar | 1250 to 1800 rev/min depending on size | FKM | 60°C | 100% of standard bearing life |
Typical Applications
- Marine cranes
- Thrusters
- Hydraulic power units
- Pulp and paper
- Turbine starters
- Tunnel boring machines
- Presses
- Steel and iron production
- Civil hydraulic engineering (hydropower, canal locks, dams, movable bridges)
Downloads
The following parts manuals are available from Danfoss for service and maintenance reference:
Contact Us for further technical details and configuration options.