Eternal Hydraulic A4VG A4VSG A4VTG Variable Displacement Piston Pump
A4VG A4VSG A4VTG is variable axial piston pump of swashplate design for hydrostatic drives in closed circuit.
1. The flow is proportional to the drive speed and displacement.
2. The flow can be infinitely varied by adjusting the swashplate angle.
3. Flow direction changes smoothly when the swashplate is moved through the neutral position.
4. A wide range of highly adaptable control devices with different control and regulating functions, for all importantapplications.
5. Two pressure-relief valves are provided on the high-pressureside to protect the hydrostatic transmission (pump and motor) from overload.
6. The high-pressure relief valves also function as boost valves.
7. The integrated boost pump acts as a feed pump and controlpressure supply.
8. The maximum boost pressure is limited by a built-in lowpressure relief valve.
9. As standard with integrated pressure cut-off
- High pressure pump for applications in closed circuits
- Size 28 … 125
- Nominal pressure 400 bar
- Maximum pressure 450 bar
- Closed circuit
- Metric version
Model Code of Variable Pump
→A4VG Series 32 PDF
How does the A4VG pump work
For the axial piston pump, regarding its working principle, we can think of it as several syringes working at the same time. Each plunger and the cylinder cooperate to form a syringe. The number of syringes depends on the number of plungers. . At the same time, these “syringes” have oil pressure and pressure. The working principle of the A4VG pump is also the same, but as a closed variable displacement piston pump, its swash plate can cross the zero position to achieve the change of the flow direction, which is a bit complicated to implement.
– The charge pump supplies the control oil. The control valve controls the displacement of the variable piston. The variable piston drives the swash plate to change the swing angle to achieve the change of the pump displacement.
– The displacement of the pump is proportional to the difference in the control oil pressure between the two pistons of the variable piston;
– Control oil size and control signals, such as electricity, liquid, and manual signals;
– The shut-off valve on the pump limits the pressure at which the pump operates;
– Safety valve on the pump to achieve system safety protection;
A4VG pump main control
According to the different types of control valves on the pump, the A4VG pump has various control modes. The following are common control methods:
– HW manual control: The pump displacement is proportional to the angle of the control valve handle.
– EP Electric Proportional Control: The pump displacement is proportional to the current signal of the proportional solenoid.
-HD hydraulic control type: Pilot-controlled hydraulic control, the displacement of the pump is proportional to the pilot pressure.
APPLICATION
Piston pumps are widely used in high-pressure, high-flow, high-power systems and where the flow needs to be regulated, such as mobile and construction equipment, engineering vehicles, heavy-duty planers, metal forming and stamping, machine tools, hydraulic presses, oilfield equipment, mining and metallurgical machinery, marine and other hydraulic systems.
Related Product
A4VSO Variable displacement pump with axial piston rotary group of swashplate design for hydrostatic drives in open circuit.
The capacity of the pump is in proportion to its rotating speed and displacement; the stepless adjustment of the displacement can be materialized by regulating the swivel angle of its swash plate.
