Product Overview
The Rexroth LFA 40 D-71/FX20 (Material No. R900948446) is a high-performance directional logic valve cover engineered by Bosch Rexroth for use with the LFA series cartridge logic elements. This cover serves as the control interface of a two-stage directional logic valve assembly, housing the pilot control bore, control passages, and mounting face that govern the main spool position within the cartridge insert. Operating on a directional spool principle, the cover directs pilot pressure to shift the main logic element, enabling precise load-holding, directional control, and pressure compensation functions within the hydraulic circuit. With a nominal size of NG40 (SAE 1½”), it is designed for high-flow industrial systems requiring reliable switching performance and leak-free operation under continuous duty cycles.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Directional Logic Valve Cover (Pilot Control Cover for Cartridge Logic Element) |
| Model Designation | LFA 40 D-71/FX20 |
| Material Number | R900948446 |
| Nominal Size | NG40 (SAE 1½”) |
| Pilot Control Type | D-71 Pilot Configuration (Internal Pilot Oil Supply, External Drain) |
| Operating Pressure | Up to 350 bar (main circuit) / Up to 315 bar (pilot circuit) |
| Mounting & Connection | Standard ISO 7368 / DIN 24342 cartridge mounting interface |
| Sealing Technology | Precision-machined sealing faces with O-ring and back-up ring provisions |
Engineering Features & Advantages
- Precision Pilot Control: The D-71 pilot configuration provides accurate spool actuation with defined opening and closing characteristics, ensuring repeatable directional switching and reliable load-holding in two-stage logic valve circuits.
- Optimized Flow Geometry: Internal control passages are precision-machined to minimize pressure drop and turbulence, supporting stable main spool movement even at high flow rates associated with NG40 cartridge elements.
- Industrial Reliability: Manufactured from high-strength cast iron with a corrosion-resistant coating, built for continuous operation under severe industrial conditions including high pressure, thermal cycling, and contaminated environments.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth LFA series logic valve assemblies, ensuring drop-in replacement without modification to existing manifolds or piping.
- Leak-Free Sealing Interface: Precision-lapped mounting face and controlled surface finish guarantee a tight seal against the cartridge element, preventing internal leakage and maintaining circuit integrity.
Typical Industrial Applications
This Rexroth LFA 40 D-71/FX20 directional logic valve cover is typically deployed in high-pressure, high-flow hydraulic systems such as plastic injection molding machines, metallurgical
PRODUCT IMAGES
Rexroth LFA 40 D-71/FX20 / R900948446 Directional Logic Valve Cover
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- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
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Shop the genuine Rexroth LFA 40 D-71/FX20 / R900948446 Proportional Directional Control Valve. This Germany-made 24 VDC hydraulic component features a 4-way proportional design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.