Rexroth Pump
Rexroth Axial Piston Variable Pump A4VG
  • Description
  • Technique Feature
  • Specification
  • Applied Range

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Data Sheet of A4VG Series 32

Data Sheet of A4VG Series 40

REXROTH Type Code of A4VG Series

 

Rexroth Axial Piston Variable Pump A4VG Description

Axial piston variable pump A4VG series 32

- High pressure pump for applications in closed circuits

- Size 28 … 125, such as A4VG 28 NVD**/32R, A4VG 40 HD3D**/32R, A4VG 56 HWD**/32R,  A4VG 71 DA1D**/32R, A4VG 90 EZ1D**/32R, A4VG 125 EP4D**/32R.

- Nominal pressure 400 bar

- Maximum pressure 450 bar

 

Axial piston variable pump A4VG series 40

- High pressure pump for applications in closed circuits up to 500 bar

- Size 110 … 280, A4VG 110 DA**/40R, A4VG 125 HW**/40R, A4VG 145 EP**/40R, A4VG 175 EZ1**/40R, A4VG 210 EZ2**/40R, A4VG 280 EP4**/40R.

- Nominal pressure 450 bar

- Maximum pressure 500 bar

 

Axial piston variable pump A4VTG series 33

- High pressure pump for the drum drive in mobile concrete mixers

- Size 71 … 90, such as A4VTG 071 EP3**/33R, A4VTG 090 EP4**/33R.

- Nominal pressure 400 bar

- Maximum pressure 450 bar

- Closed circuit

 

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.

 

 

1. Piston pump, 2. Hydraulic servo valve, 3. Variable hydraulic chamber, 4. Spool, 5. Spring and tie rod, 6. Push rod, 7. Hydraulic control port, 8. Feedback lever, 9. Piston rod , 10. Springs, 11. Pistons

 

Heash's supply is equal to your demand. we supply Rexroth piston pump A4VG series as A4VG 28, A4VG 40, A4VG 56, A4VG 71, A4VG 90, A4VG 110, A4VG 125, A4VG 140, A4VG 145, A4VG 175, A4VG 180, A4VG 250, A4VG 280... we service the world, HEASH is your trustworthy partner in hydraulic field.

Rexroth A4VG Series 32 Technical Data

Size 28 40 56 71 90 125
Displacement   Vg max cm³ 28 40 56 71 90 125
geometric, per revolution
Nominal pressure   pnom bar 400 400 400 400 400 400
Maximum pressure   pmax bar 450 450 450 450 450 450
Maximum speed at Vg max nnom rpm 4250 4000 3600 3300 3050 2850
Intermittent 1) nmax rpm 5000 5000 4500 4100 3800 3450
Flow at Vg max and nnom qV nom l/min 119 160 202 234 275 356
Power at qV nom and Δpnom 2) P kW 79 107 134 156 183 238
Torque at Vg max and Δpnom M Nm 178 255 357 452 573 796
Weight (approx.)   m kg 29 31 38 50 60 80
1) At Δp = 70 … 150 bar or Δp < 300 bar and t < 0.1 s
2) Δpnom = 400 bar
 

Rexroth A4VG series 32 Features

- Integrated boost pump for boost and pilot oil supply

- Flow direction changes smoothly when the swashplate is moved through the neutral position

- High-pressure relief valves with integrated boost function

- With adjustable pressure cut-off as standard

- Boost-pressure relief valve

- Through drive for mounting of further pumps up to same nominal size

- Large variety of controls

- Swashplate design

 

Rexroth A4VG series 40 Features

- High power density due to high pressure level

- Integrated boost pump for boost and pilot oil supply

- Flow direction changes smoothly when the swashplate is moved through the neutral position

- High-pressure relief valves with integrated boost function

- With adjustable pressure cut-off as standard

- Boost-pressure relief valve

- Through drive for mounting of further pumps up to same nominal size

- High total efficiency

- Large variety of controls

- Swashplate design

 

Application of A4VG on Hydraulic System

The A4VG pump is mainly used for closed circuit hydrostatic transmissions and has a complex structure with a variety of hydraulic control valves. Different control methods can be configured according to the actual needs of the end user, with a high degree of automation and remote control. As a power element of the hydrostatic transmission system, A4VG is the preferred plunger pump for building maintenance machinery and port machinery.

1. Hydraulic driving system for construction machinery, such as hydraulic system for pavers, hydraulic walking system for full-hydraulic vibratory roller, walking system for full-hydraulic corn harvester, walking system for coal support carrier truck, traveling system for beam transporter

2. The hydraulic driving system for special vehicles, such as the traveling system of aircraft tractors, the walking system of high-speed rail grinding cars, etc.;

3. The rotary hydraulic system of construction machinery vehicles, the rotary hydraulic system of mining excavators, the rotary hydraulic system of cranes, etc.

4. Hydraulic systems for construction machinery vehicles, such as excavators, graders, bulldozers, pumping hydraulic systems for concrete pump trucks, loaders, dock cranes, modular pallet trucks, etc.

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