Vickers VQ and VQH Series Vane Pumps
Vickers VQ and VQH pumps are fixed-displacement, high-pressure vane pumps designed for mobile equipment. VQ pumps are designed for medium-pressure mobile applications; VQH pumps are the higher-pressure, higher-performance version, sharing the same intra-vane cartridge design and the same envelope size and installation dimensions as VQ, so VQH can often be substituted directly.
The hydraulically balanced rotor design supports long bearing life. A replaceable cartridge can normally be changed in ten minutes or less, without removing the pump from its mounting, and a small stock of cartridges can serve many pump models across a fleet.
VQ is available as single, thru-drive, double and triple pumps; VQH is available as single and double pumps only. Double pumps provide a single power source for two separate hydraulic circuits, or greater combined delivery, driven through a single shaft coupling; triple pumps (VQ only) combine three pumping sections for even greater application versatility. Thru-drive versions have a rear pad for directly mounting and driving an additional pump.
Flow control and priority valve integral cover options are available on VQ single, double and triple pumps, simplifying circuit design for applications such as power steering; see Control Options below.
Key Specifications
| Specification | Detail |
| Technology | Balanced vane, fixed displacement, ten-vane cartridge design |
| Configurations | Single, thru-drive, double and triple pumps (VQ); single and double pumps (VQH) |
| Frame sizes | 20, 25, 35, 45 (VQ single/thru-drive); 25, 35, 45 (VQH single/thru-drive, no 20 frame); combined in double and triple configurations |
| Displacement range | 18 to 193 cm³/rev (1.10 to 11.80 in³/rev) per single section |
| Continuous pressure (VQ) | Up to 210 bar (3000 psi) on 20/25/35VQ, reducing to 175 bar (2500 psi) on the largest 45VQ sizes; see model tables below |
| Continuous pressure (VQH) | Up to 241 bar (3500 psi) on 25VQH, reducing to 207-228 bar (3000-3300 psi) on 35VQH and 45VQH; see model tables below |
| Rated speed | Up to 2700 rpm, reducing with frame size and displacement; see model tables below |
| Minimum speed | 600 rev/min recommended |
| Inlet pressure | Recommended gauge 0 to 0.34 bar (0 to 5 psi); maximum 1.38 bar (20 psi); inlet depression should not exceed 0.17 bar (5 in. Hg) |
| Hydraulic fluid | SAE 10W oil, or comparable viscosity; permissible viscosity range 40 to 860 cSt (180 to 4000 SUS), with speed and pressure limited to 50% of rated values below 40 cSt until warmed up |
| Fluid temperature | Fluid viscosity should not fall below 60 SUS; temperature should not exceed 99°C (210°F), or cartridge and elastomer life will decrease |
| Fluid cleanliness | ISO 4406 20/18/15 below 1000 psi, 19/17/14 between 1000 and 2000 psi, 18/16/13 above 3000 psi, for fixed vane pumps |
| Integral valve options | Flow control and relief, or priority valve and relief, available on single, double and triple pumps (VQ); see Control Options below |
| Shaft loading | Never assume pumps in a double, triple or thru-drive assembly can be simultaneously loaded to rated pressure; shaft loading must be checked for excessive torque and side loads |
VQ Single Pumps
| Series | Code | Displacement cm³/rev (in³/rev) | Max. speed (rev/min) | Continuous pressure, bar (psi) | Weight, kg (lb) |
| 20VQ | 5 | 18.0 (1.10) | 2700 | 210 (3000) | 11.8 (26) |
| 20VQ | 8 | 27.4 (1.67) | 2700 | 210 (3000) | 11.8 (26) |
| 20VQ | 11 | 36.4 (2.22) | 2700 | 210 (3000) | 11.8 (26) |
| 20VQ | 12 | 39.5 (2.41) | 2700 | 160 (2300) | 11.8 (26) |
| 20VQ | 14 | 45.9 (2.80) | 2700 | 140 (2000) | 11.8 (26) |
| 25VQ | 12 | 40.2 (2.45) | 2700 | 210 (3000) | 14.5 (32) |
| 25VQ | 14 | 45.4 (2.77) | 2700 | 210 (3000) | 14.5 (32) |
| 25VQ | 17 | 55.2 (3.37) | 2500 | 210 (3000) | 14.5 (32) |
| 25VQ | 21 | 67.5 (4.12) | 2500 | 210 (3000) | 14.5 (32) |
| 35VQ | 25 | 81.6 (4.98) | 2500 | 210 (3000) | 22.7 (50) |
| 35VQ | 30 | 97.7 (5.96) | 2500 | 210 (3000) | 22.7 (50) |
| 35VQ | 35 | 112.8 (6.88) | 2400 | 210 (3000) | 22.7 (50) |
| 35VQ | 38 | 121.6 (7.42) | 2400 | 210 (3000) | 22.7 (50) |
| 45VQ | 42 | 138.7 (8.46) | 2200 | 175 (2500) | 34.1 (75) |
| 45VQ | 50 | 162.3 (9.90) | 2200 | 175 (2500) | 34.1 (75) |
| 45VQ | 60 | 193.4 (11.80) | 2200 | 175 (2500) | 34.1 (75) |
VQH Single Pumps
| Series | Code | Displacement cm³/rev (in³/rev) | Max. speed (rev/min) | Continuous pressure, bar (psi) | Weight, kg (lb) |
| 25VQH | 12 | 40.2 (2.45) | 2700 | 241 (3500) | 14.5 (32) |
| 25VQH | 14 | 45.4 (2.77) | 2700 | 241 (3500) | 14.5 (32) |
| 25VQH | 17 | 55.2 (3.37) | 2500 | 241 (3500) | 14.5 (32) |
| 25VQH | 19 | 61.3 (3.74) | 2500 | 241 (3500) | 14.5 (32) |
| 25VQH | 21 | 67.5 (4.12) | 2500 | 241 (3500) | 14.5 (32) |
| 35VQH | 25 | 81.6 (4.98) | 2500 | 228 (3300) | 22.7 (50) |
| 35VQH | 30 | 97.7 (5.96) | 2500 | 228 (3300) | 22.7 (50) |
| 35VQH | 35 | 112.8 (6.88) | 2400 | 228 (3300) | 22.7 (50) |
| 35VQH | 38 | 121.6 (7.42) | 2400 | 228 (3300) | 22.7 (50) |
| 45VQH | 42 | 138.7 (8.46) | 2200 | 228 (3300) | 34.1 (75) |
| 45VQH | 47 | 151.9 (9.27) | 2200 | 228 (3300) | 34.1 (75) |
| 45VQH | 50 | 162.3 (9.90) | 2200 | 228 (3300) | 34.1 (75) |
| 45VQH | 57 | 190.2 (11.61) | 2200 | 228 (3300) | 34.1 (75) |
| 45VQH | 60 | 193.4 (11.80) | 2200 | 207 (3000) | 34.1 (75) |
Double, Triple and Thru-Drive Configurations
VQ double pumps combine a shaft-end and cover-end section in a single housing, in six configurations: 2520VQ, 3520VQ, 3525VQ, 4520VQ, 4525VQ and 4535VQ. VQH double pumps use the same six frame combinations (2520VQH, 3520VQH, 3525VQH, 4520VQH, 4525VQH, 4535VQH). Section displacement, speed and pressure ratings match the corresponding single pump ring sizes above; shaft loading must be checked where both sections are to be pressurised together.
VQ triple pumps combine three pumping sections – a VQ double pump plus a V10 cover-end pump – in five configurations: 2520VQSV10, 3520VQSV10, 3525VQSV10, 4525VQSV10 and 4535VQSV10. Maximum speed for the triple pump assembly is limited by the V10 section’s ring size and pressure. There is no triple pump VQH equivalent in the sources reviewed.
VQ thru-drive single pumps are available in standard bearing (25VQT, 35VQT, 45VQT) and heavy duty bearing (26VQT, 36VQT) versions; VQH thru-drive single pumps follow the same pattern (25VQHT, 35VQHT, 45VQHT). VQ thru-drive double pumps are available as 3525VQT and 4525VQT (standard bearing) or 3625VQT and 4625VQT (heavy duty bearing).
Control Options
Available on VQ single, double and triple pumps as an integral cover option.
F – Flow control and relief
Limits flow to the operating system to the desired maximum; excess flow is diverted to tank. On double and triple pumps, the deliveries of the shaft-end and centre pumps are proportional to speed. Includes a relief valve to limit maximum operating pressure; the shaft-end and centre pump pressures of double and triple pumps must be controlled by separate, external relief valves. A typical application is power steering, providing a constant oil supply through the vehicle engine’s mid to high speed range.
P – Priority valve and relief
Maintains a nearly constant flow to a primary circuit and diverts remaining flow to a secondary circuit; the amount of flow to the secondary circuit is determined by pump delivery. The primary circuit is protected by an integral relief valve; an external relief valve must be provided for the secondary and any additional circuit.
Typical Applications
- Wheel loaders
- Lift trucks
- Refuse trucks
- Aerial booms
Downloads
The following manuals are available from Danfoss for service and maintenance reference:
- Vickers Vane Pump & Motor Design Guide for Mobile Equipment
- For more downloads, visit Danfoss Power Solutions
Contact Us for further technical details and configuration options.