Description
G761-3005: Product Overview
The MOOG G761-3005 is a two-stage electrohydraulic servo valve from the G761 Series, designed for precision control of hydraulic actuators in industrial systems requiring stable performance under fluctuating load and pressure conditions. As a core component in closed-loop control architectures, it interfaces electronic controllers (e.g., PLCs, motion controllers) with hydraulic actuators (cylinders, motors), converting low-power electrical command signals into proportional hydraulic flow and pressure to regulate actuator position, velocity, or force.
The G761 Series is distinguished by its two-stage architecture: a nozzle-flapper pilot stage for signal amplification and a sliding spool main stage for flow modulation. This design ensures stable output even under varying system pressures, a key advantage over direct-drive valves in applications with load fluctuations. The G761-3005 is typically integrated into systems with position/force feedback sensors, where adjustments to the input signal maintain desired actuator behavior—essential for avoiding overshoot in machinery like material testing rigs or small industrial presses. The series emphasizes ruggedness and compatibility with industrial hydraulic fluids, reducing integration complexity for engineers.
MOOG G761-3005
G761-3005: Technical Specifications
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Model Number: G761-3005
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Manufacturer: Moog Inc.
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Product Type: Electrohydraulic Servo Valve (Two-Stage)
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Valve Configuration: 4-way spool (symmetrical flow paths, spring-centered)
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Nominal Flow: 63 L/min (16.6 GPM) @ 7 MPa (1000 psi) differential pressure
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Maximum Pressure: 350 bar (5000 psi) per port
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Input Signal: ±10VDC (standard), ±40mA (via optional amplifier)
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Response Time: <20 ms (step input to 90% flow)
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Resolution: <0.2% of full scale (hysteresis <0.7%)
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Operating Temperature: -20°C to +80°C (fluid-dependent)
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Fluid Compatibility: Petroleum-based oils (ISO VG 32/46), HFC fluids (e.g., Houghto-Safe 620)
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Weight: ~2.5 kg (5.5 lbs, valve body only)
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Dimensions: ~150mm (L) x 80mm (W) x 100mm (H) (approximate)
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Certifications: CE, ISO 9001 (manufacturing standard)
Core Features & Customer Value
The two-stage design of the G761-3005—combining a nozzle-flapper pilot stage with a sliding spool main stage—delivers stable flow output proportional to the input signal, even when system pressures fluctuate. For engineers managing machinery like material testing rigs or metal forming presses, this stability minimizes actuator drift, ensuring consistent replication of cyclic loading profiles or precise part dimensions. The nozzle-flapper stage amplifies weak electrical signals to drive the main spool, while the sliding spool modulates flow with minimal hysteresis, critical for maintaining accuracy in long-term operation.
With a <20 ms response time and <0.2% resolution, the valve enables timely adjustments to command signals and precise control of small actuator movements—valuable in high-speed applications like injection molding (clamp/unclamp sequencing) or robotic assembly (end-effector positioning). The rugged construction features a stainless steel body and hardened spool lands, resisting wear from contaminated fluids common in industrial environments. For maintenance teams, this extends service life to 10,000–15,000 operating hours (with clean fluid, particle count <15 μm), reducing replacement costs. Native compatibility with standard analog controllers (PLCs, PID loops) and optional amplifiers simplifies integration, while field-replaceable spool/sleeve assemblies minimize downtime during repairs. The spring-centered spool ensures safe actuator positioning during power loss, a critical safety feature for machinery guarding.
MOOG G761-3005
Typical Applications
The G761-3005 is suited for industrial systems requiring stable, moderate-to-high-flow hydraulic control under variable loads:
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Material Testing Rigs: Manages actuator movement in tensile/compression tests, delivering precise cyclic loading profiles (up to 10 Hz) for valid material property data.
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Small Industrial Presses: Regulates ram positioning in stamping or bending machines, maintaining tight tolerances (±0.1mm) for sheet metal components.
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Robotic Systems: Provides smooth motion control for robotic arms in assembly lines, ensuring consistent part placement accuracy (±0.2mm).
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Aerospace Simulation: Controls auxiliary actuators in flight simulators (e.g., landing gear deployment), providing realistic response for training systems.
In a fatigue test rig for composite materials, the G761-3005 controls a hydraulic cylinder to apply cyclic loads. Its stable output ensures the cylinder follows a 5Hz sinusoidal profile within ±0.1mm displacement accuracy, critical for measuring crack propagation rates. In a small press brake, it regulates ram positioning to maintain bend angles within ±0.5° tolerance, reducing scrap.
