Product Introduction: Part of Moog’s G771 series, this servo valve uses a 2-stage design with mechanical feedback to convert electrical signals into precise hydraulic flow. The pilot stage features a double-nozzle flapper configuration driven by a dry torque motor, while the output stage uses a four-way spool valve. It is engineered for durability, with components resistant to wear and contamination, ensuring long service life in industrial settings.
Technical Specifications: The rated flow rate is 19–75 l/min (5–20 gpm) at a pressure drop of 35 bar (500 psi). The maximum operating pressure is 315 bar (4,500 psi). It accepts input signals of 8–200 mA and operates on a 24 VDC power supply. The frequency response is 115–215 Hz, with a step response time of 4–17 ms, enabling high dynamic performance.
Functional Features: Mechanical feedback via a cantilever spring ensures stable spool positioning, reducing hysteresis to <0.5% for precise control. The dry torque motor eliminates the need for hydraulic fluid in the pilot stage, reducing maintenance requirements. The valve’s compact size allows installation in space-constrained systems, while its robust construction withstands vibration and temperature extremes. It is compatible with a range of hydraulic fluids, including mineral oils and synthetic esters.
Application Scenarios: Used in injection molding machines to control clamp force and injection speed, ensuring consistent part quality. In metallurgical equipment, it regulates rolling mill pressure for uniform metal sheet thickness. It also controls hydraulic actuators in flight simulators, providing realistic motion feedback for pilot training.
