moog electro hydraulic servo valve G761-3034B
2 month ago
Product details
Moog Electro-Hydraulic Servo Valve G761-3034B
1. Product Overview
The G761-3034B belongs to MOOG G761 series two-stage mechanical feedback (MFB) servo valve. It adopts dry torque motor plus double nozzle-flapper pilot stage and spool main stage with spring rod mechanical feedback structure. No built-in drive amplifier is equipped; an external servo amplifier is required for operation. As a 4-way throttling valve, it is widely used for high-precision closed-loop flow, pressure and position control in power plants, material testing machines and aerospace tooling equipment.
- Code definition of 3034B: Rated flow 9.4 L/min (2.5 GPM) at 70 bar pressure drop, standard 4-way design with internal pilot oil supply and standard coil configuration.
- Mounting standard: ISO10372-02-02-0-92 (Size 02), subplate mounting.
2. Key Hydraulic Parameters
Pressure Ratings
- Main ports P/A/B/X: Max working pressure 315 bar (4500 PSI) for standard aluminum body; optional steel body for 350 bar service.
- Tank port T: Normally ≤210 bar; up to 315 bar with external drain design. Minimum inlet supply pressure ≥14 bar (200 PSI).
- Proof test pressure: 473 bar for P port, 315 bar for T port.
Flow Specifications
- Nominal flow: 9.4 L/min at ΔP=70 bar single orifice differential pressure. The series covers 3.8/9.4/15 L/min optional flow grades.
- Null leakage: ＜0.6 L/min for standard precision machined spool.
- Flow calculation formula: Q=Q_{rated}×\sqrt{ΔP/70bar}
Static Performance
- Hysteresis: ＜3%; Resolution: ＜0.1%; Symmetry error: ＜10%
- Thermal null drift: ＜2% over 55 K temperature variation; Pressure null drift: ＜2% under 70 bar supply fluctuation; Vibration null drift: ＜2% under 10g vibration.
Dynamic Performance
- Full stroke step response: ≤2.5 ms at 210 bar supply pressure
- -3dB frequency response: 200 Hz, designed for high-speed closed-loop control.
3. Electrical Specifications
- Rated control input current: 10~40 mA for standard dual-coil; optional single coil rated 8~200 mA, typical coil impedance 2×200 Ω.
- Connector: Standard 5-pin MS3106A14S-2S military circular connector with shielding, optional reverse polarity protection.
- Coil is passive without onboard PCB; driven by external servo amplifier with ±15 VDC / ±24 VDC power supply.
4. Construction & Operating Principle (Two-Stage Mechanical Feedback)
1. Pilot Stage: Permanent magnet dry torque motor drives the flapper; symmetric dual nozzles convert flapper displacement into differential pilot pressure to realize electro-hydraulic pre-amplification.
2. Main Spool Stage: Pilot differential pressure shifts main spool; cantilever feedback spring rod fitted on spool end mechanically feeds spool position back to flapper to form closed loop, enabling linear proportionality between spool travel and input control current for accurate flow regulation.
3. Main Components: Dry torque motor, dual nozzle-flapper assembly, precision spool-sleeve set, mechanical feedback spring rod and null adjustment screw.
5. Operating Conditions & Medium
- Fluid temperature range: -29℃ ~ +135℃; Ambient temperature range: -29℃ ~ +135℃
- Compatible with mineral-based hydraulic oil; optional FKM seals for phosphate ester fire-resistant fluid. Required fluid cleanliness: NAS 6 with 5 μm filtration (precision filtration is mandatory for pilot stage).
- Recommended fluid viscosity: 10~97 cSt @40℃, preferred 60~450 SUS @38℃.
6. Dimension & Mounting Requirements
- Net weight: Approx. 370 g for aluminum housing
- Mounting hardware: Four mounting holes with M8 bolts, fasten diagonally evenly.
- Mounting surface roughness Ra≤0.8 μm, base flatness ≤0.02 mm.
7. Typical Applications
1. Thermal power industry: DEH governing system and actuator control for steam turbines (dominant application).
2. Universal material testing machines, fatigue test benches, aerospace hydraulic tooling, precision hydraulic presses, high-frequency vibration tables and military servo control systems.
8. Optional Configurations
G761K explosion-proof intrinsically safe version, external pilot oil supply, customized low null-drift design and special sealing for fire-resistant fluid, reverse flow specification on request.
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