Product Details

MOOG 773-558 belongs to MOOG 773 series two-stage mechanical feedback electro-hydraulic servo valve, designed for high precision closed-loop hydraulic control systems in power generation and industrial test equipment. This moog servo valve adopts polarized torque motor and dual-nozzle flapper pilot stage structure, delivering excellent dynamic response, low hysteresis and high resolution for long-term continuous cyclic operation. It uses mechanical spool feedback to maintain stable hydraulic flow output without electronic spool position feedback, maintaining stable control performance under vibration and temperature variation in harsh industrial environments. A field-replaceable first-stage filter is integrated inside the valve body to capture solid contaminants in hydraulic fluid, protect precision machined internal components and reduce maintenance frequency and system downtime. It accepts analog current command signals to drive the torque motor, adjust spool opening and convert electrical signals into proportional hydraulic flow output, achieving accurate control of 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 layout, widely used in gas turbine power generation control, material fatigue test benches, aerospace structural loading test systems and automotive component durability test rigs. It can cooperate with MOOG digital servo controllers to build complete multi-axis synchronous electro-hydraulic closed-loop control systems for heavy industrial loading projects.

Brand: MOOG

Model: 773-558

Series: 773 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: Gas turbine control,material fatigue test bench,aerospace loading test