Product Introduction: A compact direct-acting servo valve from Moog’s D633 series, designed for applications requiring high precision in limited space. Unlike pilot-operated valves, it uses a linear force motor to directly actuate the spool, eliminating the need for a pilot stage and reducing response time. This design makes it ideal for small to medium flow systems where dynamic performance is critical.
Technical Specifications: Rated flow is 20 l/min (5.3 gpm) at 35 bar (500 psi) pressure drop. Maximum operating pressure is 350 bar (5000 psi). The linear force motor operates on 24 VDC with a current range of ±300 mA. Frequency response is ≥200 Hz, ensuring rapid signal tracking. The valve weighs 1.5 kg (3.3 lbs) and features a compact footprint for space-constrained installations.
Functional Features: Direct spool actuation results in fast response times (≤5 ms for 90% step input) and low hysteresis (<0.3%). No pilot oil is required, simplifying system design and reducing leakage. The force motor’s robust design ensures consistent performance over temperature variations. Compatible with both open and closed-loop control systems, offering flexibility in application.
Application Scenarios: Used in medical equipment such as MRI table positioning systems, where precise movement and low noise are essential. Integral to semiconductor manufacturing machinery, controlling wafer handling robots with micrometer-level accuracy. Applied in aerospace test equipment, simulating vibration and acceleration forces with high dynamic precision.
