Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of G761-3003B in China. We warmly welcome you to wholesale bulk G761-3003B for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
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The G761-3003B is a high-performance, two-stage electro-hydraulic servovalve engineered for demanding closed-loop control systems. Designed with a frictionless double-nozzle flapper pilot stage and a precise spool-and-bushing main stage, this valve converts low-power electrical input signals into proportional hydraulic flow and pressure outputs.
Technical Specifications
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| Parameter | Specification Value | Unit |
| Valve Architecture | 2-Stage Nozzle-Flapper Mechanical Feedback | - |
| Maximum Operating Pressure (Ports P, A, B) | 315 bar (4500 psi) | bar |
| Maximum Return Pressure (Port T) | 210 bar (3000 psi) | bar |
| Rated Flow (at 70 bar total drop) | 38 L/min (10 GPM) | L/min |
| Operating Fluid Temperature Range | -20 to +120 | deg C |
| Recommended Viscosity Range | 15 to 100 | cSt (mm2/s) |
| Hysteresis | Less than 3.0% | % |
| Threshold | Less than 0.5% | % |
| Frequency Response (-3dB bandwidth) | Greater than 100 | Hz |
| Step Response Time (0 to 100% flow) | 8 to 12 | ms |
| Null Leakage Flow (at 210 bar) | Less than 1.5 | L/min |
| Coil Resistance (Standard Parallel Connection) | 80 | Ohms |
| Rated Drive Current (Parallel) | 40 | mA |
Configuration Options
▔▔- Mechanical Structure: Two-stage design featuring a nozzle-flapper pilot valve integrated with a high-precision sliding spool and sleeve main valve assembly.
- Control Method: Dual-coil torque motor accepting differential current signals for linear proportional flow control.
- Feedback Mechanism: High-rigidity cantilever feedback wire providing direct mechanical position feedback from the spool to the flapper assembly.
- Flow Ratings: Factory calibrated for 38 L/min rated flow output under standard test delta pressure conditions.
- Mounting Interface: Standard ISO 10372-04 mounting pattern (Subplate surface mounting).
- Port Configuration: Standard 4-port arrangement featuring Pressure (P), Tank (T), Work Port A, and Work Port B.
- Electrical Connection: Heavy-duty 4-pin industrial circular connector with IP65 ingress protection rating.
Key Materials and Components
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- Spool & Sleeve Assembly: Manufactured from hardened stainless tool steel, precision micro-honed to sub-micron tolerances for extreme wear resistance, low friction, and long service life.
- Pilot Stage Flapper & Nozzle: High-purity tungsten carbide nozzles paired with hardened alloy flapper surfaces to withstand fluid erosion and maintain structural integrity under continuous operation.
- Feedback Wire: Spring-grade alloy wire precision-calibrated for high fatigue strength and long-term calibration stability.
- Seals: High-performance Viton (FKM) O-rings supplied as standard, offering broad chemical compatibility with petroleum-based hydraulic oils and resistance to thermal degradation.
Packaging and Transport Protection
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- Cleanliness Protection: Factory tested and flushed under strict ISO cleanliness protocols. Ports are sealed with heavy-duty protective caps to prevent particulate contamination prior to installation.
- Moisture & Environmental Shielding: Vacuum-sealed in anti-static ESD and moisture-barrier bags containing active desiccant packs to prevent surface oxidation during transport and storage.
- Shock & Vibration Isolation: Encased in custom-molded high-density polyethylene foam inserts to absorb structural impacts during international air and ocean transit.
- Bulk Packaging: Individual boxed units are consolidated into heavy-duty double-wall corrugated outer cartons or heat-treated wooden cases for bulk shipments, fully strapped and stretch-wrapped for secure handling.
Applications
▔▔- Metal Testing Machines & Simulators: Utilized in high-frequency fatigue test rigs and universal testing machines to provide real-time dynamic force and displacement control.
- Steam & Gas Turbine Governors: Applied in power plant turbine control systems for precise valve actuator positioning and rapid speed regulation.
- Plastic Injection Molding Machinery: Installed in high-speed injection axes to manage precise multi-stage velocity profiles and pressure transition control.
- Steel Rolling Mills: Used in hydraulic automatic gauge control (AGC) cylinders for micro-positioning of press-down rolls under extreme load conditions.
- Flight Simulation & Motion Platforms: Enables high-frequency, multi-axis motion control with smooth acceleration transitions and zero motion latency.
Related Models
▔▔| Model Code | Rated Flow (L/min) | Max Pressure (bar) | Subplate Pattern | Primary Characteristics |
| G761-3001B | 19 | 315 | ISO 10372-04 | Low Flow / Ultra-High Resolution |
| G761-3002B | 28 | 315 | ISO 10372-04 | Medium Flow / Standard Dynamic |
| G761-3003B | 38 | 315 | ISO 10372-04 | Standard High-Flow Control Unit |
| G761-3004B | 63 | 315 | ISO 10372-04 | Extended Flow Capacity |
| G761-3005B | 75 | 315 | ISO 10372-04 | Maximum Flow Rate Configuration |
FAQ
▔▔Q: How do I verify if G761-3003B is the exact replacement for my existing valve?
A: Check the model code on your valve's nameplate, verify the 4-port subplate mounting pattern dimensions, and confirm that your drive amplifier supplies the 40 mA rated current requirement.
Q: What oil cleanliness level is required for operating the G761-3003B?
A: Electro-hydraulic servovalves require clean fluid. Operating fluid must be filtered to ISO 4406 Cleanliness Code 16/14/11 (or NAS 1638 Class 5) or better, using a main-line filter rated at 10 microns absolute or finer.
Q: Can I use synthetic or fire-resistant hydraulic fluids with this valve?
A: Standard units come equipped with Viton (FKM) seals, which are compatible with mineral oils, synthetic esters, and phosphate esters. For water-glycol or specialized fluids, contact our technical team to verify seal compatibility.
Contact Us
▔▔Get in touch with us and we will get in touch with you quickly to give you more personalized information.
The MOOG G761-3003B is a servo valve designed for high-performance flow control in hydraulic systems. As part of the -761 Series Flow Control Servo Valves, it functions as a throttle valve for 3-way and preferably 4-way applications. Featuring a 2-stage design, it offers precise control over a wide range of flow rates, ranging from 0.5 to 75 liters per minute (0.125 to 19.5 gallons per minute) at a valve pressure drop of 35 bar (500 psi) per spool land.
With its robust construction and high-torque driving capabilities, the MOOG G761-3003B is engineered for reliability and durability, making it suitable for various industrial applications and environments. It operates at a maximum operating pressure of 315 bar (4,500 psi) for the aluminum body and 350 bar (5,000 psi) for the steel body, ensuring stability and performance even in high-pressure conditions.
One of the standout features of the MOOG G761-3003B is its 100% step response time, which ranges from <4 to <16 milliseconds. This rapid response enables quick adjustments to flow rates, enhancing precision and efficiency in hydraulic systems. Additionally, the valve comes with a range of optional features including high null bias, magnetic null adjust, vented motor cap, special BSA fit, parallel internal wiring, reverse polarity, and very high response. These options provide flexibility and customization to suit specific application requirements.
The MOOG G761-3003B adopts the ISO 10372-04-04-0-92 mounting pattern, offering a compact size and lightweight construction for easy installation and operation. Overall, it is a powerful and reliable hydraulic valve that meets the demands of a wide range of industrial applications. With its precise flow and pressure control capabilities, the MOOG G761-3003B provides users with a dependable solution for achieving high performance and accuracy in hydraulic systems.
With its compact size and lightweight construction following the ISO 10372-04-04-0-92 mounting pattern, the MOOG G761-3003B is easy to install and operate, making it an excellent choice for hydraulic systems requiring high performance, accuracy, and reliability across a broad range of industrial applications.
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