Product Introduction: This model is part of Moog’s D661 series, a pilot-operated servo valve designed for high-precision flow control in electro-hydraulic systems. It integrates a ServoJet pilot stage with electronic feedback, converting electrical signals into hydraulic output with exceptional accuracy. The valve is built for durability, with components rated for long service life in continuous industrial operation.
Technical Specifications: The maximum operating pressure is 350 bar (5,000 psi). The rated flow rate is 50–150 l/min (13–40 gpm) at a pressure drop of 35 bar (500 psi) per land. It operates on 24 VDC (18–32 VDC) and accepts ±10 V, ±10 mA, or 4–20 mA input signals. The step response time is 8–15 ms, with a frequency response of 50–100 Hz for dynamic applications.
Functional Features: Electronic feedback via a displacement sensor enables closed-loop spool control, reducing hysteresis to <0.5% and ensuring repeatable performance. The ServoJet pilot stage enhances dynamic response, allowing rapid adjustments to input signals. It includes a fail-safe mechanism that returns the spool to a neutral position during power loss, protecting equipment from damage. The valve’s design eliminates internal pilot leakage, reducing energy consumption in multi-valve systems.
Application Scenarios: Critical in aerospace test rigs, controlling hydraulic actuators to simulate flight loads on aircraft components. In metal stamping machines, it regulates ram speed and force to prevent material deformation. It also controls the position of robotic arms in automotive assembly lines, ensuring precise part placement.
