Rexroth A4VG Closed-loop hydraulic pump for Putzmeister Concrete machinery 421418 440058 511123 511130 485655 266376002 295237002

The Rexroth A4VG series is a high-performance, variable-displacement axial piston pump designed for demanding closed-loop hydrostatic drive systems, such as those used in Putzmeister concrete machinery (e.g., truck-mounted concrete pumps, trailer pumps, and placing booms).

Core Design & Principle:

As a closed-loop pump, the A4VG is typically paired with a matching motor to form a compact, efficient circuit. The pump directly controls the speed and torque of the motor, with oil circulating between them, minimizing auxiliary components. Its swashplate design allows for precise, stepless variation of displacement and flow by changing the swashplate angle, enabling smooth control of machine travel and movement.

Key Features for Concrete Machinery:

• High Power Density & Pressure Capability:​ With maximum operating pressures up to 450 bar (EP pump) or 600 bar (HD pump), it delivers the immense, consistent power required for pumping thick concrete over long distances and heights.
• Precision Control:​ Integrated electro-hydraulic or electro-proportional controls allow for precise metering of flow, enabling fine control of concrete output (stroke speed) and boom movements crucial for accurate placement.
• High Efficiency:​ Optimized for the duty cycles of concrete pumps, it maintains high volumetric and mechanical efficiency, reducing fuel consumption and heat generation—a critical factor for continuous operation.
• Robustness & Reliability:​ Built to withstand extreme vibration, shock loads, and harsh job site conditions, including concrete dust and temperature variations. Its robust design ensures uptime for critical pumping operations.
• Load-Sensing & Pressure Limiting:​ Often incorporates pressure cut-off and load-sensing capabilities to optimize power matching, protect the system from overloads, and improve overall energy efficiency.

Role in Putzmeister Systems:

In a Putzmeister concrete pump, the A4VG typically drives the hydraulic motors for the concrete delivery cylinder's main drive (the "sending cylinder") and/or the complex multi-axis boom movements. Its precise, responsive control is essential for the smooth, shock-free operation needed to pump abrasive concrete mixes and position the boom safely and accurately.

In summary, the Rexroth A4VG closed-loop pump is a technological cornerstone in Putzmeister machinery, providing the powerful, precisely controlled, and reliable hydraulic power necessary for the extreme demands of modern concrete placement.

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Q1: Why is precise flow control especially crucial for the boom movements of a concrete pump?

A1:Precise flow control is crucial for safe and accurate boom positioning. It enables smooth, steady, and shock-free movements, which is essential for maneuvering the heavy boom in confined spaces, placing concrete with pinpoint accuracy, and ensuring operator safety by preventing sudden, jerky motions.

Q2: What is the key role of integrated features like pressure cut-off in protecting the pump and the concrete pumping system?

A2: Pressure cut-off (a form of pressure limiting) protects the system by automatically reducing the pump's displacement when a preset maximum pressure is reached. This prevents damage from pressure spikes caused by overloads (e.g., a pipeline blockage) and enhances safety.

Q3:What is the price and delivery time of the Rexroth A4VG pump for Putzmeister Concrete machinery？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4:How to purchase a Putzmeister Concrete machinery hydraulic pump?

A4:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.