Product Overview
The MOOG D634-356E / R40KO2M0NSM2 is a high-performance direct drive servo valve engineered by Moog, the global benchmark in electrohydraulic motion control. Unlike conventional two-stage pilot-operated servo valves, the D634 series utilizes a single-stage, direct drive architecture in which a high-force linear force motor (LFM) acts directly on the valve spool without intermediate hydraulic pilot stages. This design eliminates pilot flow dependency and delivers exceptionally fast dynamic response, high resolution, and repeatable positioning accuracy. The valve is configured with the R40KO2M0NSM2 spool and body variant, defining its rated flow, spool lap geometry, and porting arrangement for precise bidirectional metering. It serves as the critical control element in closed-loop hydraulic systems, translating low-power electrical command signals into proportional hydraulic flow and pressure outputs for position, velocity, force, or pressure regulation.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Direct Drive Servo Valve (Single-Stage, Spool Type) |
| Model Designation | D634-356E / R40KO2M0NSM2 |
| Manufacturer | Moog Inc. |
| Actuation Principle | Linear Force Motor (LFM) direct spool drive, no pilot stage |
| Spool Configuration | R40KO2M0NSM2 — 4-way, 3-position closed-center spool with defined lap geometry |
| Operating Pressure | Standard Industrial Grade (Up to 350 bar system pressure, port-dependent) |
| Rated Flow | Nominal flow per D634-356E rating at 70 bar valve pressure drop |
| Command Signal | Analog ±10 V DC (current or voltage command, integrated electronics) |
| Mounting & Connection | Standard ISO 4401 / CETOP 5 (NG10) subplate interface |
| Electrical Interface | Integrated valve electronics with standard industrial connector |
| Seal & Fluid Compatibility | Mineral-based hydraulic fluids per ISO 11158 / DIN 51524 |
Engineering Features & Advantages
- Precision Performance: The direct drive servo valve (single-stage, spool type) delivers precise, repeatable performance with low hysteresis and stable control across the full working range.
- 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 MOOG standards, allowing straightforward retrofit into existing hydraulic systems without rework.
Typical Industrial Applications
It serves as the critical control element in closed-loop hydraulic systems, translating low-power electrical command signals into proportional hydraulic flow and pressure outputs for position, velocity, force, or pressure regulation.
PRODUCT IMAGES
MOOG D634-356E / R40KO2M0NSM2 Direct Drive Servo Valve
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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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- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine MOOG D634-356E / R40KO2M0NSM2 Servo Valve. This Germany-made 24V DC hydraulic component features a high-response two-stage design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.