Moog G771K615A Two-Stage Electro-Hydraulic Servo Valve Unit

Feature & Principle

This two-stage servo valve uses torque motor to drive the first-stage flapper-nozzle assembly, which controls the pressure difference to drive the main spool. The spool position feedback forms closed-loop regulation. The output hydraulic flow is proportional to the input electric signal, realizing high-precision and fast-response hydraulic actuation control.

Specifications

Model: G771K615A Brand: Moog Type: Two-stage electro-hydraulic servo valve Input signal: ±10mA Mounting: Standard 02 footprint manifold Max working pressure: 210 bar Fluid cleanliness requirement: ISO 4406 14/11 or better Certification: CE

Components & Diagnostics

Torque motor, flapper-nozzle pilot stage, main spool, feedback spring, valve body, filter screen. Common faults: zero drift, no flow output, unstable control, internal leakage, blockage caused by oil contamination.

Product Brief

G771K615A servo valve, Moog high precision hydraulic spare widely used for material test bench, flight simulator, injection molding machine and metal forming equipment.