MOOG Electro-Hydraulic Servo valve G761-3005B

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Product details

I. Brand & Series Overview

MOOG is a world-leading manufacturer of electro-hydraulic control solutions. The G761 series is an industrial-grade two-stage nozzle-flapper servo valve, renowned for ultra-high dynamic response, micron-level control accuracy and robust environmental adaptability for high-end closed-loop hydraulic systems. G761-3005B is a standard flow variant adopting dry torque motor and mechanical feedback architecture, delivering industry-leading reliability and fatigue resistance.

II. Model Code Decoding

G761

- G761: Series identifier for two-stage mechanically feedback servo valves with nozzle-flapper pilot stage, complying with ISO10372 Size04 mounting standard

3005B

1. 3: Body pressure rating: max continuous working pressure of aluminum housing at 310 bar (4500 psi)

2. 005: Rated flow specification: 5 gpm (approx. 19 L/min) under standard pressure drop ΔP=7 MPa

3. B: Revised design version, standardized seal and coil configuration

III. Core Hydraulic Specifications

1. Rated Flow: 19 L/min (5 gpm) at ΔP=7 MPa, tolerance ±10%

2. Pressure Ratings

- Supply port P: 1.4 MPa minimum, 310 bar continuous max, burst pressure up to 473 bar

- Return port T: Max allowable backpressure 210 bar

3. Compatible Fluids: Conventional anti-wear mineral hydraulic oil, HFC water-glycol and other fire-resistant fluids; recommended viscosity 16~100 cSt, fluid & ambient temperature range: -29℃~+135℃

4. Filtration Standard: System cleanliness must meet NAS 1638 Class6, with a bypass-free high-pressure filter (≥3μm) installed immediately upstream of the valve

5. Pilot Supply: Internal/external supply selectable, optional 5th port for independent external pilot pressure feeding

IV. Electrical Specifications

1. Standard Command Signal: ±40 mA single coil (custom ±15 mA / ±200 mA coils available)

2. Coil Design: Dual coils for series/parallel wiring, built-in reverse polarity protection

3. Ingress Protection: IP65 for dust and moisture resistance

4. Connection: Standard aviation plug for shielded cables with minimum cross-section of 0.75 mm²

V. Dynamic & Precision Performance

1. Step Response: 5~12 ms for 100% input step signal

2. Frequency Response: -3dB bandwidth 120~180 Hz for fast signal tracking

3. Hysteresis: <3%

4. Resolution: <0.5% for micron-level position, force and pressure closed-loop control

5. Neutral Feature: Zero-lap spool design, auto-centering upon power/cable failure without external force

VI. Working Principle & Structure

1. Pilot Stage: Symmetric dual nozzle-flapper driven by dry torque motor; electrical signal deflects the flapper to create differential nozzle pressure, which actuates the main spool

2. Power Stage: Precision 4-way spool valve; spool displacement is mechanically fed back via a cantilever spring wire to form closed-loop balance, ensuring spool stroke is strictly proportional to input current

3. Optimization: Field-replaceable disc filter integrated in pilot stage to reduce clogging risks; high spool driving force for outstanding anti-jamming performance

VII. Key Structural Advantages

- Auto-centering on power failure to guarantee safe emergency shutdown

- Dynamic performance barely affected by supply pressure fluctuation for stable operation

- Mounting pattern conforms to ISO10372-04, compatible with CETOP3/6 standards

- Compact lightweight aluminum housing (net weight 1.1 kg) to save installation space

- Intrinsically safe explosion-proof versions available for hazardous chemical environments

VIII. Typical Application Fields

1. Material Testing Equipment: Closed-loop force control for fatigue, tensile and compression test machines

2. Metallurgical Industry: Mill screwdown control, strip edge guiding and tension regulation

3. Precision Machinery: Die-casting, injection molding, sheet metal forming hydraulic control

4. Aerospace & Marine: Ground loading simulators, ship rudder servo systems

5. Laboratory Research: Shaking tables, high-speed mechanical loading platforms

IX. Installation, Commissioning & Maintenance Guidelines

1. Fully flush pipelines before mounting; never disassemble under pressure; mounting surface flatness ≤0.02 mm

2. Single-end grounding for shielded cables to eliminate electromagnetic zero drift

3. Calibrate null position and replace pilot filter every 2000 working hours under normal conditions; shorten interval to 1000 hours for dusty sites

4. Case drain backpressure limited below 5 bar, drain line routed directly to tank without main return backpressure

5. Avoid long-term overpressure and overcurrent operation to prevent permanent torque motor magnetization

MOOG G761-3005B – High-Response Electro-Hydraulic Servo Valve (Hydraulic valve)

The MOOG G761-3005B is a two-stage, high-response flow control Hydraulic valve. As a classic model within the MOOG G761 series, it is widely used in demanding industrial hydraulic systems thanks to its outstanding dynamic performance and precise control accuracy. This Hydraulic valve features a dry torque motor and a double nozzle flapper pilot stage, combined with a precision-machined spool main stage, enabling the linear conversion of a weak electrical signal into high-flow hydraulic output. It delivers millisecond-level response times and exceptional positioning repeatability for your hydraulic system.

Whether in injection molding machines, die casting machines, test equipment, or metal forming machine tools, the G761-3005B high-performance Hydraulic valve precisely controls the position, speed, and force of actuators within the hydraulic system, enabling closed-loop control of complex motion profiles. Its built-in spool position feedback mechanism ensures stable control characteristics, significantly reducing hysteresis and resolution limitations, and making the entire hydraulic system run more smoothly and efficiently. At the same time, the robust modular design makes this Hydraulic valve easy to integrate and maintain, capable of withstanding harsh industrial environments with high contamination and vibration levels, thereby considerably enhancing the reliability of the hydraulic system.

With its superior control quality and durability, the MOOG G761-3005B Hydraulic valve has become a key core component for elevating the performance and automation level of hydraulic systems.