Product Details

MOOG 631-550A belongs to the well-known MOOG 631 series two-stage mechanical feedback electro-hydraulic servo valve, widely adopted for high-precision closed-loop hydraulic control systems. This moog servo valve features polarized torque motor and low-friction dual-nozzle flapper pilot stage structure, bringing outstanding performance including fast dynamic response, ultra-low hysteresis and excellent repeatability during long-term cyclic loading operations. It adopts mechanical spool feedback design to stabilize hydraulic flow output without electronic spool position feedback, maintaining stable control performance under vibration and ambient temperature fluctuation in harsh industrial working conditions. A field-replaceable first-stage filter is integrated inside the valve body, which effectively captures solid particulate contaminants in hydraulic fluid, protects the precision internal components of the servo valve and reduces maintenance downtime. It accepts standard analog current command signal, which drives the torque motor to adjust spool opening and convert electrical signals into proportional hydraulic flow output, so as to accurately control displacement, speed and loading force of hydraulic actuators. The valve body is precision machined from high-strength alloy steel with anti-corrosion surface treatment, compatible with mineral oil and fire-resistant hydraulic fluid. This electro-hydraulic valve supports 3-way and 4-way hydraulic circuit applications, and is widely used in material fatigue test benches, aerospace structural loading test systems, automotive component durability test equipment and hydraulic simulation platforms. It can cooperate with MOOG digital servo controllers to build complete multi-axis synchronous electro-hydraulic closed-loop control systems.

Brand: MOOG

Model: 631-550A

Series: 631 Series

Product Type: Two-stage Mechanical Feedback Electro-hydraulic Servo Valve

Structure: Polarized torque motor, dual-nozzle flapper pilot stage

Feedback Type: Mechanical spool feedback

Control Signal: Analog current signal

Max Working Pressure: 350 bar (5000 psi)

Built-in Component: Field replaceable first stage filter

Fluid Medium: Mineral oil, fire-resistant hydraulic fluid

Application: Aerospace loading test,material fatigue test bench,automotive component test