0102030405
China Suppliers Factory LA4VSO Series Equivalent Replacement Hydraulic Piston Pump for Open Loop Circuits
Features
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Swashplate axial piston pump.
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Adjust the angle of swashplate to realize the stepless variable.
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Good suction characteristic.
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Have the structural design of compact, light weight, low noise characteristics.
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The sensitivity of control system.
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Flow is proportional to the drive speed and to the displacement.
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Nominal pressure reach to 35 Mpa.
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Long service life, high-precision bearings.
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Hydrostatic balance slipper, improve the life of pump.
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With swashplate angle indicator.
Model Designation
| Hydraulic | L |
|---|
| Mineral oils | No mark |
| HF; HFB and HFC-Mediums | E |
| Variable displacement pump, industrial uses | A4VS |
| Pump, open circuits | O |
| Displacement Vg max(ml/r) | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|
| Pressure control DR | √ | √ | √ | √ | √ | √ | √ | DR... |
| Power control with Hyperbolic open, curve LR | √ | √ | √ | √ | √ | √ | √ | LR... |
| Manual control MA | √ | √ | √ | √ | √ | √ | √ | MA... |
| Electronic control EO | √ | √ | √ | √ | √ | √ | √ | EO... |
| Hydraulic control, pilot pressure dependent HD | √ | √ | √ | √ | √ | √ | √ | HD... |
| √ | √ | - | - | - | √ | - | 10 | |
| - | - | √ | √ | √ | √ | √ | 22 | |
| - | √ | √ | √ | √ | √ | √ | 30 |
| Clockwise | R |
| Counter clockwise | L |
| NBR Nitrile rubber | P |
| FKM Fluoro-rubber | V |
| Keyed parallel shaft | P |
| Splined shaft | Z |
| ISO 4 hole | √ | √ | √ | √ | √ | √ | - | B |
| Port B and port S 90° offset; Auxiliary pressure port B1 Metric fixing screws | √ | √ | √ | √ | √ | √ | √ | 13 |
| Port B and S 90° offset; Pressure connection B1 connected by flange | √ | √ | √ | √ | √ | √ | √ | 25 |
| Without auxiliary pump, without through drive | √ | √ | √ | √ | √ | √ | - | N00 |
Technical Data
Performance parameters (These figures did not consider the mechanical and volumetric efficiency)
| Size | Unit | 40 | 71 | 125 | 180 | 250 | 355 | 500 | |
|---|---|---|---|---|---|---|---|---|---|
| Displacement (Vg max) | cm³/r | 40 | 71 | 125 | 180 | 250 | 355 | 500 | |
| Max. speed (n max1) | rpm | 2600 | 2200 | 1800 | 1800 | 1500 | 1500 | 1320 | |
| Max. output flow | n=n max | L/min | 104 | 156 | 225 | 324 | 375 | 532 | 600 |
| n=1500rpm | L/min | 60 | 107 | 186 | 270 | 375 | 532 | － | |
| Max. power | n=n max | kW | 61 | 91 | 131 | 189 | 219 | 310 | 385 |
| n=1500rpm | kW | 35 | 62 | 109 | 158 | 219 | 310 | － | |
| Max. torque | △P=35MPa | N.m | 223 | 395 | 696 | 1002 | 1391 | 1976 | 2783 |
| △P=10MPa | N.m | 64 | 113 | 199 | 286 | 398 | 564 | 795 | |
| Weight (approximately) | kg | 40 | 54 | 87 | 103 | 186 | 206 | 318 | |
Outline drawing
| Size | Unit | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|---|---|---|---|---|---|---|---|
| Control moving distance | mm | 14.2 | 17.3 | 20.7 | 20.7 | 25.9 | 25.9 | 32.6 |
| Control area | cm² | 3.9 | 6.4 | 9 | 9 | 14.4 | 14.4 | 18.8 |
| Control volume | cm³ | 5.5 | 11 | 18.7 | 18.7 | 37.3 | 37.3 | 61.4 |
| Min. control pressure | MPa | 3 | 3 | 5 | 5 | 5 | 5 | 5 |
| Control time 20MPa pressure | s | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.8 |
(2) EO Hydraulic displacement control HD
Outline
In the EO electric control work, the pump flow could set by proportion direction valve. Meanwhile, pump's current flow through inductance type position transducer feedback signal. This pump could reset the cylinder's zero position by the spring controls in the situation of normal pressure. Do not reset at high-pressured work. Simultaneously, in order to reduce controls cylinder's loss of flow, all size of hydraulic pressure fluid cylinder cavity is sealed.
Outline drawing
| Size | Unit | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|---|---|---|---|---|---|---|---|
| Control cylinder’s moving distance | mm | 14.2 | 17.3 | 20.7 | 20.7 | 25.9 | 25.9 | 32.8 |
| Control cylinder area | cm² | 8.1 | 12.6 | 18.1 | 16.1 | 28.3 | 28.3 | 38.2 |
| Control volume | cm³ | 11.4 | 21.5 | 37.5 | 37.5 | 73.2 | 73.2 | 124.5 |
| Min. control pressure | MPa | 10 | 10 | 10 | 12.5 | 12.5 | 12.5 | 15 |
| Max. control pressure | MPa | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 |
| Control time | s | 0.1 | 0.12 | 0.2 | 0.2 | 0.25 | 0.25 | 0.3 |
(3) LR Power control LR
Outline
At the very beginning, the control scope could use the mechanical way to set, the setting value scope could use the spring and screw to adjust. When the pressure decreases, we could adjust spring and enter its starting position, the setting range of preset value: 3.5MPa--35MPa. The smallest and the biggest angle of rotation's limit can use the mechanical way, adjustment to Vg max 50%.
Frequently Asked Questions
What is the nominal working pressure of this swashplate axial piston pump?
The nominal pressure of the pump reaches up to 35 MPa, ensuring high performance in demanding industrial applications.
What types of control operations are supported by the LA4VSO series equivalent pump?
It supports multiple control modes including Pressure Control (DR), Power Control (LR), Manual Control (MA), Electronic Control (EO), and Hydraulic Control (HD).
How does the EO electronic displacement control operate?
Under EO electronic control, the pump flow is set by a proportional directional valve, while the flow feedback is registered via an inductance-type position transducer.
What hydraulic fluids are compatible with this piston pump series?
The pump is compatible with mineral oils, as well as HF, HFB, and HFC-Mediums when configured with the appropriate designation.
Does the pump design support variable displacements?
Yes, the pump features a swashplate design where adjusting the angle of the swashplate allows for stepless variable displacement.
What range of sizes is available for this axial piston unit?
This pump is available in sizes 40, 71, 125, 180, 250, 355, and 500, covering a broad displacement range.