The PGH5-30/250RE07VU2 fixed-displacement internal gear pump

I. Product Overview

The PGH5-30/250RE07VU2 is a fixed-displacement internal gear pump from the Rexroth brand, with the material number R901147121. This pump utilizes clearance compensation technology, offering low noise, low pulsation, and high efficiency, making it suitable for medium-to-high pressure industrial hydraulic systems.

II. Working Principle

The pump is driven by a hydraulically mounted pinion shaft, which rotates the internal gear. In the suction range, the tooth gaps between the pinion and the internal gear open, drawing in hydraulic oil. In the pressure range, these tooth gaps close, delivering the hydraulic oil to the pressure port. The suction and pressure ranges are separated by radial compensation elements as well as the tooth meshing between the internal gear and the pinion shaft, ensuring efficient operation of the pump.

III. Structural Features

  1. Fixed Displacement: The pump has a fixed displacement, and different sizes can be selected to meet various flow requirements.

  2. Clearance Compensation: Utilizes clearance compensation technology to achieve high efficiency even at low speeds and low viscosities.

  3. Low Noise: Optimized gear tooth profiles and pump body design effectively reduce operational noise.

  4. Low Pulsation: The gear pump offers minimal flow pulsation, suitable for applications requiring stable flow.

  5. Long Service Life: Sliding bearings and sealed clearance compensation design extend the pump's service life.

  6. Flexible Combination: All frame sizes and specifications can be combined with each other, and can also be used in combination with axial piston pumps, internal gear pumps, and vane pumps.

IV. Performance Parameters

  • Model: PGH5-30/250RE07VU2

  • Material Number: R901147121

  • Displacement: 250.5 cm³/rev (specific displacement may vary slightly depending on the model)

  • Operating Pressure: Up to 350 bar (specific operating pressure may vary depending on the application and configuration)

  • Speed Range: Adaptable to various speed requirements, depending on the application needs

  • Noise Level: Low noise design, suitable for noise-sensitive application environments

  • Connection Type: ISO 24560 mounting flange conforming to ISO 4-3019 and VDMA 2, facilitating easy installation and connection

V. Application Scenarios

The PGH5-30/250RE07VU2 fixed-displacement internal gear pump is widely used in the following fields:

  1. Industrial Hydraulic Systems: Such as machine tools and presses, which require high-pressure, high-frequency start-stop, and low-leakage hydraulic systems.

  2. Mobile Machinery: Such as lifting equipment, fans, and expanders, which require fatigue-resistant drives with relatively high operating pressures.

olding Machines: Provides stable hydraulic power for injection molding machines, ensuring precise control of the injection process.

  4. Auxiliary Circuit Charging/Make-up Oil: Offers reliable hydraulic support in auxiliary circuits requiring rapid charging or make-up oil.

VI. Maintenance and Troubleshooting

  1. Daily Maintenance:

      • Regularly check the cleanliness of the oil to prevent impurities from entering the pump body.

      • Monitor the oil temperature to prevent overheating, which can lead to aging of seals.

      • Check the tightness of bolts to prevent loosening, which can cause leaks.

  2. Common Faults and Handling:

      • Insufficient Flow: Check if the suction filter is clogged or if the gear or pump body is worn.

      • Pressure Fluctuations: Investigate for stuck safety valves, abnormal oil viscosity, or internal leaks within the pump.

      • Abnormal Noise: Confirm proper gear meshing or check for damaged bearings.

The PGH5-30/250RE07VU2 is a fixed-displacement internal gear pump from the PGH5 series (Material No. R901147121). It is suitable for medium-to-high pressure, low-pulsation, and low-noise industrial hydraulic systems, and is commonly used in injection molding machines, machine tools, presses, and for charging/make-up oil in auxiliary circuits.