Product Overview
The Rexroth LC 50 DB20D70 (Material Number R900938038) is a two-stage logic cartridge valve engineered for high-flow, high-pressure hydraulic control in demanding industrial systems. As part of the Rexroth LC series, this cartridge-style directional element functions as a pilot-operated, normally closed (type D) logic valve with a 50 mm nominal cartridge size and a 70 bar cracking pressure setting. The valve operates on a two-stage working principle: a pilot stage (typically a directional spool valve) controls the pressure on the main poppet’s control chamber, while the main stage opens or closes the primary flow path between ports A and B. This design allows the LC 50 DB20D70 to deliver exceptionally high flow capacity with minimal pressure drop, making it an ideal building block for compact manifold-based hydraulic circuits, directional control blocks, and pressure-holding functions in modern industrial machinery.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Hydraulic Valve — Logic Cartridge Valve (Two-Stage, Directional Control Element) |
| Model Designation | LC 50 DB20D70 / R900938038 |
| Nominal Cartridge Size | NG50 (50 mm nominal diameter) |
| Function Type | Type D — Normally Closed (poppet held closed by spring and pilot pressure) |
| Cracking Pressure | 70 bar (DB20D70 setting) |
| Operating Pressure | Up to 350 bar (standard industrial grade for LC series) |
| Pilot Actuation | External pilot supply via directional spool valve (pilot stage) |
| Mounting & Connection | Cartridge mounting into manifold block per ISO 7368 / Rexroth standard cavity |
| Sealing | O-ring and back-up ring, cartridge-style face seal |
| Media | Mineral oil based hydraulic fluid (HLP, HLVP per DIN 51524) |
Engineering Features & Advantages
- Precision Performance: The two-stage poppet-and-pilot design delivers fast, repeatable response with minimal internal leakage, ensuring accurate directional control and reliable load holding in high-pressure circuits.
- High Flow Capacity: The NG50 cartridge size provides a large flow cross-section with low pressure drop, enabling efficient operation in high-volume hydraulic systems without sacrificing control precision.
- Industrial Reliability: Constructed for continuous duty with durable, corrosion-resistant materials and proven engineering for maximum system uptime.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth OEM standards, ensuring drop-in replacement without modification to existing manifolds or piping.
Typical Industrial Applications
This design allows the LC 50 DB20D70 to deliver exceptionally high flow capacity with minimal pressure drop, making it an ideal building block for compact manifold-based hydraulic circuits, directional control blocks, and pressure-holding functions in modern industrial machinery.
PRODUCT IMAGES
Rexroth LC 50 DB20D70 / R900938038 Logic Cartridge 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 LC 50 DB20D70 / R900938038 Pilot Operated Check Valve. This Germany-made hydraulic component features a robust poppet design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.