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China Suppliers LA4VSO Series Hydraulic Piston Pump - Axial Piston Variable Pump from Reliable Factory
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
| Hydraulic | L |
Hydraulic Fluid
| Mineral oils | No mark |
| HF; HFB and HFC-Mediums | E |
Axial piston unit
| Variable displacement pump, industrial uses | A4VS |
Type of operation
| Pump, open circuits | O |
Size
| Displacement Vg max(ml/r) | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|
Mode of operation
| Control Type | 40 | 71 | 125 | 180 | 250 | 355 | 500 | Code |
|---|---|---|---|---|---|---|---|---|
| Pressure control | √ | √ | √ | √ | √ | √ | √ | DR... |
| Power control with Hyperbolic open curve | √ | √ | √ | √ | √ | √ | √ | LR... |
| Manual control | √ | √ | √ | √ | √ | √ | √ | MA... |
| Electronic control | √ | √ | √ | √ | √ | √ | √ | EO... |
| Hydraulic control, pilot pressure dependent | √ | √ | √ | √ | √ | √ | √ | HD... |
Series
| Series 10 | √ | √ | - | - | - | √ | - | 10 |
| Series 22 | - | - | √ | √ | √ | √ | √ | 22 |
| Series 30 | - | √ | √ | √ | √ | √ | √ | 30 |
Direction of rotation (With view on shaft end)
| Clockwise | R |
| Counter clockwise | L |
Seals
| NBR Nitrile rubber | P |
| FKM Fluoro-rubber | V |
Shaft end
| Keyed parallel shaft | P |
| Splined shaft | Z |
Mounting flange (40, 71, 125, 180, 250, 355, 500)
| ISO 4 hole | √ | √ | √ | √ | √ | √ | - | B |
Service ports
| 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 |
Through drive
| Without auxiliary pump, without through drive | √ | √ | √ | √ | √ | √ | - | N00 |
Technical Data
Performance parameters (these figures do not consider 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 | 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 (FAQ)
Q1: What are the key features of the LA4VSO series equivalent hydraulic piston pump?
The pump features a swashplate axial piston design with stepless variable displacement, excellent suction characteristics, a compact and lightweight structure, low noise operation, high-precision bearings for long service life, and a swashplate angle indicator.
Q2: What nominal pressure can the LA4VSO equivalent pump reach?
The nominal pressure of this axial piston pump can reach up to 35 MPa, making it suitable for demanding industrial applications.
Q3: What control options are available for this series of pumps?
It supports multiple control modes including Pressure control (DR), Power control with Hyperbolic open curve (LR), Manual control (MA), Electronic control (EO), and Hydraulic control dependent on pilot pressure (HD).
Q4: How does the EO Electronic Control function?
In EO electronic displacement control, the pump flow is set by a proportional directional valve. An inductance-type position transducer provides feedback on the current flow. Under normal working pressure, the spring controls can reset the cylinder's zero position.
Q5: What is the setting range of the preset value for the LR Power Control?
The setting range of the preset value is 3.5 MPa to 35 MPa. The control scope can be set mechanically, and adjustments can be made via the spring and screw. The limit of rotation angle can be adjusted mechanically down to 50% of Vg max.
Q6: Which hydraulic fluids are compatible with the LA4VSO equivalent pump?
The pump is designed to operate with mineral oils (no special mark required) as well as HF, HFB, and HFC-Mediums (marked with E in the model designation).