Description
D761-2763: Product Overview
The D761-2763 is a two-stage electrohydraulic servo valve from the D761 Series, engineered for precision control of hydraulic actuators in industrial systems requiring stable performance under varying load conditions. Within an automation architecture, it serves as the critical interface between electronic controllers (e.g., PLCs, motion controllers) and hydraulic actuators (cylinders, motors), converting low-power electrical command signals into proportional hydraulic flow and pressure to regulate actuator position, velocity, or force.
This valve belongs to the D761 Series, a platform distinguished by its two-stage design: a nozzle-flapper pilot stage for signal amplification and a sliding spool main stage for flow modulation. This architecture ensures stable output across fluctuating system pressures, making it suitable for applications where consistent actuator behavior is critical. The D761-2763 is typically integrated into closed-loop control systems with position/force feedback, 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 D761 Series emphasizes ruggedness and compatibility with industrial hydraulic fluids, reducing integration complexity for engineers.
MOOG D691-Z2708G
D761-2763: Technical Specifications
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Model Number: D761-2763
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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: 12 GPM (45.4 L/min) @ 1000 psi (69 bar) differential pressure
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Maximum Pressure: 3000 psi (207 bar) per port
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Input Signal: ±10VDC (standard), ±40mA (via optional G122 series amplifier)
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Response Time: <18 ms (step input to 90% flow)
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Resolution: <0.15% of full scale (hysteresis <0.6%)
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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: 2.3 kg (5.1 lbs, valve body only)
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Dimensions: 150mm (L) x 81mm (W) x 106mm (H) (approximate)
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Certifications: CE, ISO 9001 (manufacturing standard)
Core Features & Customer Value
The two-stage design of the D761-2763—combining a nozzle-flapper pilot stage with a sliding spool main stage—delivers stable flow output proportional to the ±10VDC input, even under fluctuating system pressures. For engineers managing machinery like material testing rigs, this stability minimizes actuator drift, ensuring consistent replication of cyclic loading profiles.
With a nominal flow of 12 GPM and <0.15% resolution, the valve provides adequate capacity for moderate-sized actuators without oversizing. The <18 ms response time allows timely adjustments during transient conditions (e.g., sudden load changes in a hydraulic press), improving cycle time predictability.
The valve’s 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 12,000–16,000 operating hours, reducing replacement costs. The spring-centered spool ensures safe actuator positioning during power loss, a critical safety feature for machinery guarding.
Native compatibility with standard analog controllers (PLCs, PID loops) and optional G122 series amplifiers simplifies integration, avoiding custom signal conversion hardware. Field-replaceable spool/sleeve assemblies minimize downtime during repairs, streamlining maintenance workflows.
MOOG D691-Z2708G
Typical Applications
The D761-2763 is applied in systems requiring stable, moderate-to-high-flow hydraulic control:
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Material Testing: Fatigue rigs (cyclic load application up to 15 Hz), tensile/compression testers.
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Small Industrial Machinery: Robotic part feeders (positioning accuracy ±0.15mm), small press brakes (bend angle control).
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Laboratory Equipment: Benchtop hydraulic trainers, fluid power demonstration systems.
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Aerospace Simulation: Auxiliary actuator control in flight simulators (e.g., landing gear deployment).
In a fatigue test rig for composite materials, the D761-2763 controls a hydraulic cylinder to apply cyclic loads. Its <18 ms response ensures the cylinder follows a 5Hz sinusoidal profile within ±0.1mm displacement accuracy, critical for valid material property data. In a small press brake, it regulates ram positioning to maintain bend angles within ±0.5° tolerance, reducing scrap.
