Product Introduction: This model is a direct-acting servo valve (DDV) from Moog’s D633 series, featuring closed-loop spool position control without a pilot stage. It uses a linear force motor to directly drive the spool, eliminating pilot oil requirements and reducing energy consumption. The valve is designed for high-precision applications, with integrated electronics for seamless system integration.
Technical Specifications: The maximum operating pressure is 350 bar (5,000 psi). The rated flow rate is 10–75 l/min (2.6–19.8 gpm) at a pressure drop of 70 bar (1,000 psi). It operates on 24 VDC (18–32 VDC) and accepts ±10 V or 4–20 mA input signals. The step response time is <15 ms, with a frequency response of 60–100 Hz for dynamic control.
Functional Features: Direct drive by a linear force motor provides high power density and fast response, with resolution <0.1% for precise adjustments. Closed-loop control via an integrated sensor ensures stability, even under varying load conditions. The valve’s design resists contamination, with a filtration requirement of ISO 4406 16/13, ensuring reliable operation in harsh environments. It includes a spring-centered fail-safe mechanism, returning the spool to neutral during power loss.
Application Scenarios: Used in wind turbines to control blade pitch, optimizing energy capture in varying wind conditions. In metal forming equipment, it regulates press force and speed for precise part shaping. It also controls hydraulic actuators in industrial robots, enabling precise movement for assembly and material handling tasks.
