Rexroth A4VHO Series 30 Axial Piston Variable Pump A4VHO450HS5/30

描述

Rexroth A4VHO Series 30 Axial Piston Variable Pump A4VHO450HS5/30

The A4VHO is a variable-displacement axial piston pump built in swashplate design, manufactured by Bosch Rexroth AG for open-circuit hydrostatic drives. It belongs to the same family as the better-known A4VSO and A4VBO series, but it’s purpose-built for the high-pressure end of the range — currently offered in Size 450 (NG 450), with a nominal pressure of 630 bar and a maximum pressure rating of 700 bar.

That pressure class is the whole point of the design. Where a standard A4VSO tops out around 350 bar, the A4VHO is engineered specifically for applications where 350 bar simply isn’t enough — think high-force presses, heavy metal-forming lines, and test rigs that need to simulate extreme loads.

Key identifiers at a glance:

Design type: Swashplate, variable displacement, open circuit

Displacement: Up to 450 cm³ per revolution (Vg max)

Nominal pressure: 630 bar

Maximum pressure: 700 bar

Maximum speed: 1,500 rpm

Maximum flow: Up to 675 l/min at nominal speed and full displacement

Power output: Up to 709 kW at nominal pressure and full displacement

Control option: HS5 electro-hydraulic control with proportional valve

Where the A4VHO Actually Gets Used

This isn’t a general-purpose pump, and Rexroth doesn’t market it as one. It shows up specifically where standard 350-bar architecture runs out of headroom.

Heavy Press and Forming Applications

Metal-forming presses — forging presses, deep-drawing presses, extrusion presses — routinely need pressure spikes well above what a conventional A4VSO can deliver comfortably. The A4VHO’s 630 bar nominal rating (with 700 bar peak capability) lets machine builders hit those forces without stacking multiple lower-pressure pumps or oversizing cylinders just to compensate for the pressure headroom they don’t have.

High-Force Test Rigs

Structural and fatigue test rigs that simulate extreme loading — aerospace component testing, automotive structural testing, large-scale material testing — need a pump that can deliver both high pressure and a fast, accurate response to rapidly changing setpoints. The HS5 control’s sub-second actuating time (as low as 300 ms) and tight linearity specs make the A4VHO a natural fit for closed-loop servo-hydraulic test systems.

Combination and Tandem Pump Setups

Because many industrial machines need more than one independent hydraulic circuit, Rexroth designed the A4VHO to be combined with a second A4VHO or an A4VSO pump on a shared through-drive, eliminating the need for a separate splitter gearbox. A typical combination — for example, A4VHO 450 + A4VSO NG250 — lets one prime mover drive two independent circuits at two different pressure classes from a single shaft.