Product Overview
The MOOG D661-6373E / G15HOCA5VSX2HA is a high-performance servo proportional valve from the MOOG D661 series, engineered for precise electrohydraulic control in demanding industrial applications. Utilizing MOOG’s proven two-stage servo valve design, this unit features a torque motor pilot stage that actuates a precision spool within the main stage, delivering exceptional dynamic response, high resolution, and minimal hysteresis. The D661 platform is widely recognized for its robust construction and reliable performance in closed-loop position, velocity, and force control systems, making it a critical component in high-precision hydraulic motion control architectures.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Servo Proportional Valve (Two-Stage, Spool Type) |
| Model Designation | D661-6373E / G15HOCA5VSX2HA |
| Operating Pressure | Up to 350 bar (5,080 psi) rated |
| Rated Flow | Approx. 15–40 L/min at 70 bar valve pressure drop (model-dependent) |
| Pilot Stage | Torque motor with dual nozzle-flapper or jet pilot design |
| Spool Configuration | Four-way, closed-center spool with precision metering lands |
| Mounting & Connection | Standard ISO 4401 / CETOP subplate mounting interface |
| Electrical Interface | Integrated valve electronics (OBE) with analog/digital command signal |
| Hysteresis | < 0.5% of rated signal |
| Response Time | < 10 ms (step response, typical) |
Engineering Features & Advantages
- Precision Performance: The torque motor pilot stage and precision-ground spool deliver ultra-low hysteresis, high resolution, and excellent repeatability for critical closed-loop motion control tasks.
- High Dynamic Response: Fast step response and wide frequency bandwidth enable accurate tracking of demanding velocity and position profiles in high-cycle industrial machinery.
- Integrated Valve Electronics (OBE): On-board electronics simplify wiring, improve signal integrity, and allow field-adjustable tuning for optimized system performance.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with robust contamination tolerance and long service life.
- Direct Fit Replacement: Precision-manufactured to original MOOG specifications for direct replacement, minimising downtime and eliminating fitment issues.
Typical Industrial Applications
The D661 platform is widely recognized for its robust construction and reliable performance in closed-loop position, velocity, and force control systems, making it a critical component in high-precision hydraulic motion control architectures.
PRODUCT IMAGES






MOOG D661-6373E / G15HOCA5VSX2HA 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 D661-6373E / G15HOCA5VSX2HA Servo Proportional Valve. This Germany-made hydraulic component features a high-response pilot stage, delivering leak-free, reliable fluid control for heavy-duty industrial systems.