0102030405
China Suppliers Factory: Rexroth LA4VSO Series Equivalent Hydraulic Piston Pump for Open Loop Circuits
Features
✓
Swashplate axial piston pump.
✓
Adjust the angle of swashplate to realize the stepless variable.
✓
Good suction characteristic.
✓
Have the structural design of compact, light weight, low noise characteristics.
✓
The sensitivity of control system.
✓
Flow is proportional to the drive speed and to the displacement.
✓
Nominal pressure reach to 35 Mpa.
✓
Long service life, high-precision bearings.
✓
Hydrostatic balance slipper, improve the life of pump.
✓
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 |
| With view on shaft end | 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 | 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 | 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 | 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 (FAQ)
What is the nominal operating pressure of this swashplate axial piston pump?
The nominal operating pressure of the pump reaches up to 35 MPa.
What types of hydraulic fluids are compatible with this series?
It is compatible with standard Mineral Oils (indicated by no mark) as well as HF, HFB, and HFC-Mediums (indicated by the mark "E").
How does the EO Electric Control option regulate the pump flow?
Under EO electric control, the pump flow is adjusted using a proportional directional valve. An inductance type position transducer is utilized to provide a feedback signal of the current flow.
What is the setting range for the preset value under LR Power Control?
The setting range of the preset value is from 3.5 MPa to 35 MPa, which can be adjusted mechanically using a spring and screw configuration.
Does the pump feature a zero-position reset for the cylinder?
Yes, the pump can reset the cylinder's zero position using spring controls under normal pressure conditions. However, resetting should not be performed during high-pressure operation.
What sizes are available for this variable displacement pump?
This pump series is available in nominal sizes of 40, 71, 125, 180, 250, 355, and 500.