K3VL K3VL28/45/80/140/200 Axial Piston Variable Displacement High Pressure Hydraulic Pump K3VL80/B-10RJM-PO-M438

I. Core Technical Parameters
Basic specifications
Type: K3VL series swash plate axial variable piston pump. 80 indicates a nominal displacement of approximately 80cc/rev, B-10RJM is the control configuration code, PO is the oil port form, and M438 is the special function code
Nominal displacement: 80cc/rev (80 milliliters per revolution), actual displacement approximately 71cc/rev, theoretical flow rate is directly proportional to the rotational speed
Rated pressure: 32MPa (320bar), short-term peak up to 35MPa (350bar), suitable for high-pressure systems
Rated speed: 1900-2100r/min, maximum allowable speed 2700r/min, minimum stable speed ≥300r/min
Rotation direction: Right rotation (clockwise when viewed from the shaft end), and left rotation is available for some models
Weight: Approximately 45kg (excluding accessories), compact structure, and high power density
Working parameters
Volumetric efficiency: ≥95% (under rated conditions), with low energy conversion loss
Overall efficiency: ≥88%, with highly efficient comprehensive performance
Applicable medium: hydraulic oil, flame retardant liquid, etc. Viscosity range: 10-300mm²/s, optimal working viscosity: 20-60mm²/s
Medium temperature: -20℃ to +80℃, recommended working temperature: 30-60℃. Avoid high temperature causing a decrease in oil viscosity
Noise level: <70dB (A), smooth operation, and good noise control
Oil cleanliness: ISO 4406 18/15 grade. A 10μm precision oil inlet filter must be installed to protect the precision componentsIi. Working Principle
Working mechanism of swash plate axial piston pump
Core structure
It is composed of a drive shaft, cylinder block, plungers (usually 7 to 9), swash plates, distribution plates and variable mechanism
The plungers are evenly distributed along the circumference of the cylinder block, and the plunger heads are in contact with the swash plates through sliding shoes
The oil distribution plate is fixed on the pump casing and has oil suction and discharge Windows, which are respectively connected to the inlet and outlet of the pump
Oil absorption process
The transmission shaft drives the cylinder block to rotate, and the swash plate forms a certain Angle (tilt Angle) with the cylinder block axis.
When the plunger rotates to the high point of the swash plate, it is forced to extend outward, increasing the volume of the plunger cavity and creating a vacuum
The oil in the fuel tank enters the plunger chamber through the oil suction window of the oil distribution plate under the action of atmospheric pressure
Oil discharge process
The cylinder block continues to rotate. When the plunger reaches the lower part of the swash plate, it is pushed back into the cylinder block, and the volume of the plunger cavity decreases
When the oil pressure rises, the check valve of the oil distribution plate’s oil discharge window is pushed open, and the high-pressure oil is discharged through the outlet
Each plunger completes one oil suction and discharge cycle per revolution. The continuous operation of multiple plungers ensures a stable output flow rate
Principle of variable control
The B-10RJM control representation adopts a combined control mode of load sensitivity and pressure cut-off
The output flow rate is controlled by adjusting the plunger stroke by changing the inclination Angle of the swash plate (tilt Angle)
When the inclination Angle increases, the plunger stroke increases and the output flow rate increases. When the inclination Angle decreases, the flow rate decreases. When the inclination Angle is 0, the flow rate is 0
Load sensitivity function: Automatically adjust the output flow when the system load changes to avoid overflow loss and achieve significant energy savings
Pressure cut-off function: When the system pressure reaches the set value, the displacement will be automatically reduced to the minimum to protect the system safety

Iii. Product Features and Advantages
1. Outstanding variable control performance
Load sensitive control: Automatically sense the system demand, output flow as needed, and achieve energy-saving effects of 30-50%
Pressure cut-off protection: Prevents system overpressure, extends equipment lifespan, and enhances safety
Precise flow regulation: Variable range 0-100%, high control accuracy, suitable for precision hydraulic systems
Rapid response: The variable control response time is less than 200ms, which can quickly track load changes and reduce pressure fluctuations
2. Excellent high-voltage performance and reliability
High working pressure: 32MPa rated pressure, up to 35MPa for short periods, meeting various high-pressure application requirements
Sturdy structure: Made of high-strength materials and with precise manufacturing processes, the average mean time between failures exceeds 10,000 hours
Strong impact resistance: It can withstand a short-term impact of 120% of the rated pressure and adapt to harsh working conditions
Low-noise operation: Optimized fluid mechanics design keeps noise below 70dB, improving the working environment
3. Structural and maintenance advantages
Compact design: Small radial dimensions, light weight, easy to install, suitable for space-constrained scenarios
High self-priming capacity: It can be started without additional priming, and the suction lift can reach 4 meters (depending on the viscosity of the medium)
Easy maintenance: Modular design makes it easy to disassemble and replace worn parts, resulting in low maintenance costs
Multiple control methods: In addition to load sensitivity + pressure cut-off, other control methods (such as electro-hydraulic ratio, constant power, etc.) can also be selected to meet different application requirements
4. Wide applicability
Wide range of medium adaptability: It can use various hydraulic media and adapt to different working environments
Strong temperature adaptability: Operating temperature range of -20℃ to +80℃, suitable for extreme working conditions
Multiple installation methods: Various shaft end and connection configurations facilitate system integration

Iv. Usage Functions and Purposes
Core functions
Convert mechanical energy into hydraulic energy to provide high-pressure and controllable fluid power for the hydraulic system
Precisely control fluid flow and pressure to achieve precise motion control of actuating elements (hydraulic cylinders, motors)
In coordination with the electrical control system, it realizes the automated production process, enhancing efficiency and product quality
Main application fields
Construction machinery
Excavator: Provides high-pressure power for the boom, bucket arm and bucket to achieve precise excavation
Loader: Provides a stable hydraulic source for the lifting and tilting systems to ensure smooth operation under heavy load conditions
Rollers and pavers: They provide power for vibration systems and walking drives, ensuring construction quality
Industrial hydraulic system
Injection molding machine: It provides high-pressure clamping force and precise injection control to ensure the accuracy of plastic products
Hydraulic press: Provides stable high pressure for metal forming and pressing processes, with a maximum pressure of up to 320bar
Machine tool: It provides power for the movement of the worktable and the feed system, ensuring processing accuracy
Special Vehicles and equipment
Aerial work platform: It provides power for the lifting and rotating systems to ensure the platform’s stability and precise positioning
Ship deck machinery: Provides hydraulic power for cranes and winches, adapting to harsh Marine environments
Agricultural machinery: Provides reliable power for the hydraulic systems of harvesters and tractors
Other fields
Concrete pump truck: Provides high-pressure power for the pumping system to ensure the efficiency of concrete transportation
Rotary drilling rig: As an auxiliary pump, it provides a stable hydraulic source to enhance drilling efficiency
Mining machinery: Provides reliable hydraulic power for lifting, towing and crushing equipment

V. Applicable Machines and Scenarios
1. Typical applicable machines
8-ton class excavator
It is particularly suitable for 8-ton excavators such as Sany 75-9/75-10, XCMG 75/80, Lingong 75/80, and Shantui 75
As the main pump, it provides strong power to ensure the excavation force and operational accuracy
The load sensitivity feature enables the excavator to automatically adjust the output under different working conditions, reducing energy consumption and improving fuel efficiency
Concrete pump truck
Provide a 320bar high-pressure oil source for the pumping system to ensure the efficient transportation of concrete
Variable control enables the pump to automatically adjust the flow rate at different pumping stages, reducing overflow losses and achieving significant energy savings
The pressure cut-off function protects the system safety and prevents overpressure damage
Injection molding equipment
Provide stable high-pressure clamping force for small and medium-sized injection molding machines (with clamping force of 1000-2000 tons)
During the pressure-holding stage, the flow output is significantly reduced, lowering energy consumption by 50-80% while maintaining a stable pressure
Precise control ensures uniform mold closure and prevents defects such as flash and deformation in plastic products
2. Characteristics of applicable scenarios
Construction machinery operating conditions with large and frequent load variations
For instance, during the compound movements of excavators and the loading and unloading processes of loaders, the pump can automatically adjust the output according to the load, avoiding overflow losses and achieving significant energy savings
Multi-axis systems requiring precise synchronous control:
For instance, in multi-cylinder synchronous lifting and ship steering gear systems, the precise variable control of the K3VL80 can achieve a synchronization accuracy of less than 0.5%
Industrial automation equipment requiring rapid response:
For instance, in robot joint drives and precision machining machines, the variable response time is less than 200ms, ensuring precise and smooth movements
Large-scale hydraulic systems that are energy-efficient and highly effective are needed
Variable control enables the pump to output a small flow rate at low loads, significantly reducing energy consumption. It is particularly suitable for intermittent operation equipment
Construction machinery operating in harsh environments:
Such as in mines and water conservancy projects, the temperature adaptability range of -20℃ to +80℃ and the sturdy and durable structure ensure long-term reliable operation

Six. Similar models
1. Different specifications and models of the same series
K3VL45: With a displacement of approximately 45cc/rev and a lighter weight (about 35kg), it is suitable for small hydraulic systems and scenarios with high space requirements
K3VL112: With a displacement of approximately 112cc/rev, it offers a larger output flow rate and is suitable for medium-sized construction machinery and applications requiring high flow rates
K3VL140: With a displacement of approximately 140cc/rev, it offers greater output flow and torque, making it suitable for large-scale construction machinery and heavy industrial equipment
2. Different series models of the same type
K3V63: Different series of the same brand, with a displacement of approximately 63cc/rev. Some features are similar and it is suitable for 6-7 ton excavators
K5V80: Another series of the same brand, with a displacement of 80cc/rev, featuring a different variable control mechanism, suitable for specific application scenarios
A10VSO Series (Domestic imitation) : Displacement range 28-140cc/rev, working pressure up to 35MPa, with obvious price advantage, suitable for applications with limited budgets
3. Domestic similar products
YCY series: Domestic high-performance variable piston pumps, using new materials and manufacturing processes, have been improved in terms of anti-pollution and durability
Other domestic alternatives to the K3VL series: With similar performance and more economical prices, they are suitable for the domestic construction machinery matching and maintenance market