Product Introduction: This model is part of Moog’s D661 series, a high-performance pilot-operated servo valve designed for precise electro-hydraulic control. It integrates advanced electronics with a robust hydraulic design, converting low-power electrical signals into high-power hydraulic output to regulate actuator movement in complex systems. The valve is engineered for reliability in demanding industrial environments, ensuring consistent performance under varying pressure and temperature conditions.
Technical Specifications: The maximum operating pressure is 350 bar (5,000 psi). The rated flow ranges from 20 to 200 l/min (5.3 to 53 gpm) at a pressure drop of 35 bar (500 psi) per land. The 100% step response time is 6.5 to 14 ms at 210 bar (3,000 psi). It operates on a 24 VDC power supply (18 to 32 VDC) and accepts input signals of ±10 V, ±10 mA, or 4-20 mA. The mounting pattern conforms to ISO 4401 size 05, and the valve weighs approximately 5.6 kg.
Functional Features: Equipped with a ServoJet pilot stage for enhanced dynamic response, it delivers precise flow control with minimal hysteresis (<1.0%) and high resolution (<0.2%). The spool position is electrically feedback-controlled via an integrated displacement sensor and electronic amplifier, ensuring closed-loop accuracy. It includes a fail-safe mechanism that returns the spool to a safe position during power loss, preventing system damage. The valve’s design eliminates internal pilot-stage leakage, reducing energy consumption—ideal for multi-valve systems.
Application Scenarios: Widely used in aerospace simulation, metal forming, and power generation. In aerospace, it controls flight simulator actuators to replicate realistic motion. In steel mills, it regulates rolling mill pressure and speed for consistent material quality. It also enhances precision in plastic injection molding machines, controlling clamp force and injection speed to improve part accuracy.
