MOOG G772K240 Two-stage Electro-hydraulic Flow Servo Valve

Product Description

MOOG G772K240 is a two-stage electro-hydraulic flow servo valve of MOOG G772 high-performance nozzle-flapper servo valve series. It adopts dry torque motor plus double nozzle-flapper pilot stage and main spool with mechanical feedback. It converts low-power analog electrical control signal into proportional hydraulic flow output to realize closed-loop control of position, speed and pressure for hydraulic actuators. It features ultra-high resolution, low hysteresis and fast dynamic response. The spool returns to zero automatically upon power loss or signal loss with fail-safe function. No built-in drive electronics, external servo amplifier is required. Mounting pattern complies with ISO10372 standard. Robust structure with excellent vibration and shock resistance. Widely used in steam turbine DEH electro-hydraulic control systems and heavy-duty test equipment for high-precision hydraulic control.

Specifications

• Model: G772K240
• Brand: MOOG (USA)
• Type: Two-stage, nozzle-flapper, mechanical feedback electro-hydraulic servo valve
• Rated Flow: 57 L/min (15 gpm @ 7MPa pressure drop)
• Max Operating Pressure: 210 bar (3000 psi, 350 bar optional)
• Input Signal: ±8mA analog current signal, external servo amplifier required
• Step Response: 4~17 ms
• Resolution: <0.1% full scale
• Hysteresis: <0.2%
• Working Fluid: Fire-resistant fluid, mineral hydraulic oil
• Mounting Standard: ISO10372-03-03-0-92 (size 03 manifold mount)
• Null Bias: Field adjustable null offset
• Fail-safe Mode: Spool returns to zero on loss of power / control signal
• Operating Temperature: -20℃ ~ +80℃
• Storage Temperature: -40℃ ~ +100℃
• Weight: approx. 3.0 kg
• Certifications: CE, intrinsically safe explosion-proof version available
• Features: Dry torque motor, dual nozzle pilot stage, high spool driving force, low friction, high dynamic response, mechanical feedback, adjustable null

Application

Primarily applied in steam turbine DEH digital electro-hydraulic control systems in power plants to precisely control valve actuators for turbine speed and load regulation. It is also used in material testing machines, metal forming presses, wind tunnel simulators, heavy-duty hydraulic test benches and metallurgical rolling mills for high-precision hydraulic closed-loop control. It receives analog commands from control system and outputs proportional hydraulic flow to drive hydraulic actuators, realizing precise regulation of valve position, thrust and motion speed. Suitable for critical heavy-duty applications requiring fast response, high control accuracy and long-term stability.

Series Models (MOOG G771/G772 Servo Valve Series)

1. G772K240: 57L/min two-stage flow servo valve (obsolete, replacement G772K336A)
2. G772K241A: Lower flow variant
3. G772K272A: Same flow rate with different fitting interface
4. G772K336A: Upgrade replacement for G772K240
5. G772K337A: Upgrade replacement for G772K241A
6. G771K200A: G771 series smaller flow servo valve with same architecture
7. G773K Series: Higher flow two-stage servo valves