MOOG G772K240A Two-Stage Electro-Hydraulic Servo Valve

Description

MOOG G772K240A Two-Stage Electro-Hydraulic Servo Valve

Product Dimensions：

The MOOG G772K240A is a high-performance, two-stage Electro-Hydraulic Servo Valve belonging to the renowned G772 (formerly 772 series). These valves are world-class standards for throttle control, designed to transform low-power electrical signals into precise hydraulic flow or pressure.

Product Detailed Description

The G772K240A is a mechanical feedback (MFB) servo valve. It utilizes a friction-free nozzle-flapper pilot stage and a stainless steel spool-and-sleeve assembly. This specific model is recognized for its high dynamics and rugged construction, making it the “gold standard” for closed-loop control of position, velocity, and force in industrial machinery.

Technical Parameters

Product Advantages

• Superior Precision: The nozzle-flapper design provides extremely high resolution and minimal deadband, essential for high-accuracy positioning.
• Rugged Longevity: The stainless steel spool-and-sleeve assembly is precision-lapped to ensure a long service life with minimal wear, even under high-cycle conditions.
• High Dynamics: Excellent frequency response allows the valve to react nearly instantaneously to control signal changes.
• Field-Proven Reliability: The G772 series is one of the most widely used servo valves globally, meaning parts and repair services are readily available.
• External Filter: Most models include a field-replaceable pilot stage filter to protect the sensitive internal nozzles from contamination.

Important Considerations (Precautions)

• Fluid Cleanliness: This is the most critical factor. The hydraulic oil must meet ISO 4406 14/11/08 (or NAS 1638 Class 5) standards. Particles as small as 5 microns can clog the nozzle or erode the spool.
• Filtration: A high-quality non-bypass filter (absolute rating \le 10 \mu m) must be installed immediately upstream of the valve.
• Priming & Air Bleeding: Ensure the hydraulic system is fully bled of air before operation. Trapped air can cause “sponginess,” instability, and potential damage to the nozzle-flapper.
• Null Adjustment: The valve has a mechanical null adjustment screw. This should only be adjusted by trained personnel to center the spool position at zero signal.

Product Applications

The MOOG G772K240A is utilized in applications where millisecond precision and high force are required:

• Plastic Injection Molding: Precise control of the injection cylinder speed and pressure.
• Metal Press & Forging: Synchronizing multiple cylinders in high-tonnage hydraulic presses.
• Flight Simulators: Providing realistic, high-speed motion cues for civil and military flight training.
• Testing Equipment: Powering high-frequency fatigue testing rigs for automotive and aerospace components.
• Steel Mills: Controlling the gauge (thickness) of steel during the rolling process.

Payment: Bank of Chicago, Bank of Singapore

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