Product Overview
The Rexroth PGH4-31/050RE11VU2 (Material Number: R900981704) is a high-performance internal gear pump engineered by Bosch Rexroth for demanding industrial hydraulic systems. Operating on the proven internal gear principle, this fixed-displacement pump features a pinion gear driving an internally toothed ring gear, with a crescent-shaped filler piece separating the suction and pressure chambers. This design delivers exceptionally smooth, low-pulsation flow with minimal noise emission, making it ideal for applications where quiet operation and precise volumetric consistency are critical. The PGH4 series is a direct-fit, drop-in replacement for the widely used PGH4 internal gear pump platform, offering reliable performance in continuous-duty industrial environments.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Internal Gear Pump (Fixed Displacement) |
| Model Designation | PGH4-31/050RE11VU2 |
| Material Number | R900981704 |
| Series / Size | PGH4 Series, Size 31 (Nominal Displacement Group) |
| Nominal Displacement | Approx. 50 cm³/rev (per size code 050) |
| Operating Pressure | Continuous: up to 250 bar / Peak: up to 280 bar (standard industrial grade) |
| Speed Range | Up to 3,000 rpm (dependent on fluid viscosity and pressure) |
| Mounting & Connection | Standard SAE / ISO 4-bolt flange, splined or keyed shaft interface |
| Hydraulic Fluid | Mineral oil HL/HLP per DIN 51524; viscosity range 10–300 mm²/s |
| Direction of Rotation | Clockwise (viewed from drive shaft end) |
Engineering Features & Advantages
- Low-Noise Internal Gear Design: The crescent-type internal gear geometry with precision-ground tooth profiles ensures exceptionally quiet operation and minimal pressure pulsation, reducing system noise levels and extending component life in noise-sensitive installations.
- High Volumetric Efficiency: Tight axial and radial clearances between the pinion, ring gear, and crescent filler deliver superior volumetric efficiency and stable flow output across the full operating pressure range.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with robust construction and wear-resistant internal components for extended service life.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth standards, allowing straightforward retrofit into existing hydraulic systems without rework.
Typical Industrial Applications
The PGH4 series is a direct-fit, drop-in replacement for the widely used PGH4 internal gear pump platform, offering reliable performance in continuous-duty industrial environments.
PRODUCT IMAGES
Rexroth PGH4-31/050RE11VU2 / R900981704 Internal Gear Pump
âš¡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine REXROTH PGH4-31/050RE11VU2 / R900981704 Internal Gear Pump. This Germany-made high-pressure hydraulic component features a fixed displacement internal gear design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.