Moog 772K240 Two-Stage Electro-Hydraulic Servo Valve

Description

Moog 772K240 Two-Stage Electro-Hydraulic Servo Valve

Product Dimensions：

The Moog 772K240 is a high-performance Two-Stage Servo Valve with mechanical feedback. It is part of the legendary 770 series, specifically designed for high-flow industrial applications where precise control of position, velocity, or force is required in closed-loop hydraulic systems.

Product Detailed Description

The 772K240 utilizes a nozzle-flapper pilot stage driven by a friction-less permanent magnet torque motor. The second stage consists of a precision-fit spool and sleeve. A mechanical feedback wire connects the spool to the torque motor armature, ensuring that the spool position is proportional to the electrical input current. The “772” designation typically refers to a specific body size and flow capacity within the Moog high-response lineup.

Technical Parameters

Product Advantages

• High Dynamic Response: Capable of extremely fast reaction times, making it ideal for high-speed simulation and precision machining.
• Mechanical Feedback: The physical feedback wire provides a highly reliable, “hard-wired” loop that ensures the valve returns to center/neutral if the signal is lost.
• Rugged Construction: Built to withstand harsh industrial environments, including high vibration and temperature fluctuations.
• Minimal Friction: The nozzle-flapper pilot stage has no sliding parts, which reduces wear and enhances the sensitivity of the valve to small signal changes.

Important Considerations & Precautions

• Fluid Cleanliness (Critical): This is a precision instrument. The hydraulic oil must be filtered to ISO 4406 14/11/08 (or NAS 1638 Class 5) or better. Contamination is the leading cause of nozzle blockage and spool sticking.
• Flushing: Always flush the hydraulic system thoroughly with a “flushing block” before installing the servo valve for the first time.
• Null Adjustment: The valve has a mechanical null adjustment. This should only be adjusted by trained personnel to ensure the valve is perfectly centered under zero-signal conditions.
• Seals Compatibility: Ensure that the hydraulic fluid used (mineral oil, phosphate ester, etc.) is compatible with the seal material (e.g., Viton) specified for the 772K240.

Product Applications

The Moog 772K240 is found in the world’s most demanding hydraulic systems:

• Aerospace Testing: Flight simulators and structural load testing rigs.
• Metal Forming: Precision control of hydraulic presses, synchronized cylinders, and rolling mills.
• Power Generation: Controlling steam and gas turbine governor valves or fuel bypass systems.
• Injection Molding: Precise injection speed and pressure control in high-end plastic machinery.
• Civil Engineering: Managing large-scale earthquake simulation tables and dam gate actuators.

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