Moog G77X/-77X series high-performance flow control servo valve

Product positioning and structure

G77X/-77X is a two-stage flow control servo valve of Muge industrial grade. It adopts a closed center four-way slide valve main stage and a symmetrical dual nozzle baffle pilot stage. It is driven by a dual air gap dry torque motor and a cantilever spring to achieve mechanical feedback of the valve core position. The structure is sturdy, the service life is long, and the reliability is high.

Applicable scenarios: high-precision electro-hydraulic position, velocity, pressure, force closed-loop control system

Explosion proof version: certified by FM, ATEX, CSA, TIIS, IECEx, suitable for use in hazardous locations

Model and installation specifications

Model Installation Standard Maximum Flow Interface Aperture

G771/771 ISO 10372-02-02-0-92 17 l/min 4.85 mm

G772/772 ISO 10372-03-03-0-92 57 l/min 6.63 mm

G773/773 Muge exclusive 63 l/min 7.92 mm

Core performance parameters

Hydraulic parameters

Maximum working pressure: 210 bar (3000 psi) (universal for P/A/B/T ports)

Rated pressure drop: 35 bar/spool shoulder

Rated flow rate: 4, 10, 19, 38, 57 l/min

Internal leakage rate: maximum 1.9 l/min (zero overlap)

Oil: DIN 51524/ISO 11158 hydraulic oil

Viscosity: 10~97 mm ²/s (recommended), 5~1250 mm ²/s (allowed)

Dynamic/static indicators

Step response (0~100% travel): 4/4/4/10/17 ms

Threshold: ≤ 0.5% rated signal

Hysteresis: ≤ 3.0% rated signal

Temperature drift (Δ T=38 ℃): ≤ 2.0% rated signal

Environment and Machinery

Working temperature: -40~+135 ℃

Storage temperature: -40~+60 ℃

Vibration resistance: 30 g, 10-2000 Hz

Impact resistance: 30g, 3-axis

Weight: 0.86 kg

Sealing: FKM (Viton B) 90 Shore

Electrical parameters

Coil specifications: H-type (± 15mA), L-type (± 40mA)

Coil connection method: single coil/series/parallel

Standard connector: 4-pin MS3106F14S-2S

Power consumption: 0.023~0.128 W

Working principle

Electrical signal input → Torque motor drives armature/baffle deflection

Pressure difference change of nozzle baffle → driving the main valve core to move

The valve core drives the feedback spring to generate force balance → the valve core stabilizes at the corresponding opening

The output flow rate is proportional to the input electrical signal, achieving precise flow control

Adjustment and installation

Zero adjustment: Mechanical eccentric sleeve adjustment, range * * ± 10% * * rated flow, requires 3/8 “wrench+3/32” hexagon socket

Flow formula: Q=QN × √ (Δ P/Δ PN)

Valve core form: Standard shaft cut, positive overlap, negative overlap optional

Installation surface flatness: ≤ 0.05 mm/100mm, roughness Ra ≤ 0.8 μ m

Maintenance and Storage

Routine maintenance: Replace the filter element every 6 months or 4000 hours, and conduct a full stroke motion test

Storage conditions: -40~60 ℃, humidity<65%, dust-proof and vibration proof, vacuum packaging

If stored for more than 5 years, it needs to be returned to the factory for testing, and if stored for more than 10 years, it must be tested

Matching and ordering

Accessories: installation bolts, flushing plate, matching joints, servo amplifier

The ordering code includes: model, flow rate, pressure, valve core, pilot, connector, seal, signal, etc

Preferred models: G771-3001A/3002A, G772-3003A/3004A, G773-3005A