MOOG G771K208 Electro-Hydraulic Servo Valve

Feature & Principle

The torque motor receives analog control signal and drives the armature baffle assembly to form differential pressure at the nozzle. The pressure difference pushes the spool to move, controls the flow direction and flow rate of hydraulic oil, and drives the hydraulic actuator. Mechanical feedback structure stabilizes spool position, achieves high-precision, fast dynamic response closed-loop control.

Specifications

Model: G771K208 Brand: MOOG Series: G771 Stage: Two-stage, nozzle-flapper pilot Max working pressure: 210 bar Fluid: Fire-resistant hydraulic oil Signal type: Analog control signal Mounting: Standard servo valve installation surface Application: Steam turbine DEH system Certification: CE

Components & Diagnostics

Torque motor, armature baffle, nozzle, spool sleeve, feedback spring, hydraulic port. Common faults: no response, zero drift, oil leakage, slow response, internal blockage caused by oil pollution.

Product Brief

G771K208 servo valve, MOOG precision hydraulic spare widely used for power plant steam turbine DEH hydraulic control cabinet overhaul and replacement.