A4VSO180DRG/30L-PPB25N00 Rexroth A4VSO180 series piston pump made in Germany

The Rexroth A4VSO180DRG/30L-PPB25N00 is a genuine German-manufactured A4VSO series open-circuit axial piston variable pump, equipped with DRG pressure compensator (constant pressure control with pilot pressure limitation). With a displacement of 180 cm³/r and PPB25 SAE flange & ports, the pump maintains a preset system pressure by reducing displacement toward zero once pressure is reached, while also allowing remote pressure setting via an external pilot pressure signal (pilot port X).

This makes the DRG version more flexible than standard DR — ideal for centralized hydraulic power units where pressure setpoints are controlled remotely from a main valve stand or PLC-controlled pilot relief valve. Rated for 350 bar continuous / 400 bar peak, it is widely used in industrial presses, test rigs, and process plant hydraulic stations.

• Same basic function as DR: maintains constant system pressure by reducing displacement as pressure approaches the setpoint
• Key upgrade: pressure setpoint can be adjusted remotely via pilot pressure at port X (instead of mechanical spring adjustment only)
• Allows central hydraulic stations to have pressure commanded from a distant control panel or via a pilot-operated relief valve
• Built-in pressure limitation protects against over-pressurization
• Reduces heat generation and energy loss in hold/standby mode

➡ Best choice when you need remote pressure setting capability on a constant-pressure pump.

• Central hydraulic power units (HPU) for multiple press lines or machine cells
• Heavy stamping / forging press clamp and hold circuits
• Industrial test benches requiring remotely adjustable pressure setpoint
• Metal forming, plastic injection molding (clamp side aux pump)
• Process plant hydraulic systems with centralized pressure control

Distributed through Rexroth's authorized global dealer network, including:

• Europe: Germany, Italy, France, UK, Spain, Netherlands, Austria, Switzerland, Poland, Sweden
• Asia-Pacific: China, Japan, South Korea, India, Taiwan, Thailand, Malaysia, Vietnam, Australia
• Americas: USA, Canada, Mexico, Brazil, Chile (industrial regions)
• Middle East & Africa: UAE, Saudi Arabia, Turkey, South Africa

A1: DR has a mechanically adjustable spring for pressure setting only. DRG also includes a pilot pressure port (X) so the pressure setpoint can be adjusted remotely by applying pilot pressure — useful for centralized HPUs or automated pressure changeover.

A2: Yes. If no pilot pressure is applied to port X, the pump regulates to the spring-set minimum/maximum pressure per the internal adjustment. Applying pilot pressure raises the effective set pressure proportionally.

A3: No. The A4VSO series is designed exclusively for open circuit (open loop) systems. For closed-loop travel/wheel drives, use the A4VG or A4VM series.