Product Overview
The MOOG D634-319C / R40KO2MONSP2 is a high-performance servo proportional valve from the MOOG D634 series, engineered for precise electrohydraulic control of flow and pressure in demanding industrial and mobile applications. Utilizing a robust spool-and-sleeve design with integrated position feedback, this valve delivers exceptional dynamic response, high resolution, and superior repeatability. The D634 series is a direct-operated, two-stage servo proportional valve that converts electrical input signals into proportional hydraulic output, making it an ideal choice for closed-loop motion control systems requiring accurate velocity, position, or force regulation. With its rugged construction and field-proven MOOG reliability, the D634-319C / R40KO2MONSP2 ensures stable operation even under the most severe industrial conditions.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Servo Proportional Valve (Two-Stage, Spool Type) |
| Model Designation | D634-319C / R40KO2MONSP2 |
| Operating Pressure | Up to 315 bar (standard industrial grade) |
| Rated Flow | Model-dependent, up to 100 L/min at 70 bar valve pressure drop |
| Mounting & Connection | Standard ISO 4401 / CETOP interface, subplate mounting |
| Electrical Interface | Proportional solenoid with integrated position transducer (LVDT) |
| Control Signal | Analog ±10 V DC or ±20 mA (typical) |
| Hysteresis | ≤ 0.5% of rated signal |
| Response Time | ≤ 10 ms (typical, step response) |
| Seal Material | NBR / FKM (depending on fluid compatibility) |
| Fluid Temperature Range | -20°C to +80°C (standard) |
Engineering Features & Advantages
- Precision Performance: Two-stage spool design with integrated position feedback ensures high-resolution flow control, minimal hysteresis, and excellent repeatability for closed-loop servo applications.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with rugged construction and proven MOOG quality standards for long service life.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original MOOG standards, allowing straightforward retrofit into existing hydraulic systems without rework.
Typical Industrial Applications
With its rugged construction and field-proven MOOG reliability, the D634-319C / R40KO2MONSP2 ensures stable operation even under the most severe industrial conditions.
PRODUCT IMAGES




MOOG D634-319C / R40KO2MONSP2 Servo Proportional 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 MOOG D634-319C / R40KO2MONSP2 Servo Proportional Valve. This Germany-made hydraulic component features a direct-drive spool design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.