Product Overview
The Rexroth DR 20-4-45/200YM (Material No. R900418952) is a pilot-operated pressure reducing valve designed for precise secondary circuit pressure regulation in industrial hydraulic systems. Manufactured by Bosch Rexroth, this valve belongs to the proven DR series, which is widely recognized for its robust construction and reliable performance in demanding applications. The valve maintains a constant reduced outlet pressure regardless of fluctuations in the inlet pressure or changes in flow demand, making it essential for systems requiring stable downstream pressure control. The “YM” suffix indicates a specific adjustment and control configuration, while the “45” designates the nominal pressure setting range and the “200” indicates the maximum adjustable secondary pressure in bar. This valve is a direct-fit, drop-in replacement for OEM Rexroth components, ensuring seamless integration into existing hydraulic circuits without modification.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pressure Reducing Valve (Pilot-Operated) |
| Model Designation | DR 20-4-45/200YM / R900418952 |
| Operating Pressure | Up to 200 bar (secondary pressure setting range) |
| Mounting & Connection | Standard ISO / Manufacturer Interface (subplate mounting) |
| Nominal Size | NG20 (DIN 24340) |
| Adjustment Type | Mechanical adjustment with locknut (YM configuration) |
| Pressure Setting Range | 45 bar to 200 bar (adjustable) |
| Fluid Compatibility | Mineral oil based hydraulic fluids (HL, HLP, HFC, HFD) |
| Seal Material | NBR (Buna-N) standard, FKM available on request |
Engineering Features & Advantages
- Precision Performance: Pilot-operated design ensures accurate and stable reduced pressure regulation, maintaining constant outlet pressure even under varying flow conditions and inlet pressure fluctuations.
- Industrial Reliability: Built for continuous operation under severe industrial conditions with a robust cast iron or steel housing that withstands high pressure and mechanical stress.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM Rexroth DR series valves, ensuring drop-in installation without system modification.
- Adjustable Pressure Control: The YM adjustment mechanism allows precise setting of secondary pressure from 45 to 200 bar, with a locknut to prevent unintended changes due to vibration.
- Leakage-Free Sealing: High-quality sealing elements and precision-machined spool and sleeve assembly minimize internal leakage and ensure long 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 valve maintains a constant reduced outlet pressure regardless of fluctuations in the inlet pressure or changes in flow demand, making it essential for systems requiring stable downstream pressure control.
PRODUCT IMAGES
REXROTH DR 20-4-45/200YM / R900418952 Pressure Reducing Valve
⚡ 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 DR 20-4-45/200YM / R900418952 Pressure Relief Valve. This Germany-made hydraulic component features a pilot-operated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.