Moog G772 K620 Hydraulic Servo Valve

Moog G772K620A servo valve
Moog G772 K620 Hydraulic Servo Valve - Image 2
Moog G772 K620 Hydraulic Servo Valve - Image 3
Moog G772 K620 Hydraulic Servo Valve - Image 4
Moog G772 K620 Hydraulic Servo Valve - Image 5

Description:

The Moog G772 K620A is a two-stage, pilot‑operated servo valve from Moog’s high-performance G772 series. Built with a spool-and-bushing design and a nozzle-flapper pilot stage, this valve delivers precise flow control, high dynamics, and exceptional stability. It is widely used in industrial hydraulic systems where accuracy, fast response, and reliability are essential, such as in power generation, test rigs, and motion-control applications.

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Advantages of the Moog G772 K620 Hydraulic Servo Valve

  1. High Precision & Low Hysteresis
    The valve’s two-stage design with a nozzle-flapper pilot and low-friction spool delivers extremely fine control, improving accuracy in sensitive applications.

  2. Fast Dynamic Response
    With step response times in the low milliseconds (4–17 ms) and broad frequency response, the G772K620A supports rapid actuation and dynamic load conditions.

  3. Wide Temperature & Harsh Environment Tolerance
    Operable from –40 °C to +135 °C, and built to survive high shock and vibration (30 g), making it suitable for rigorous industrial environments.

  4. Robust, Long‑Life Design
    The spool-and-bushing architecture offers durability, and the external design supports field-adjustable null bias, reducing maintenance needs.

  5. Safety & Reliability
    Built-in failsafe: loss of electrical signal returns the valve to center (zero flow), enabling predictable and safe shutdown in control systems.

  6. Fluid Compatibility
    The design is compatible with a variety of hydraulic fluids, thanks to the dry torque motor and robust sealing materials (Viton, etc.).

Parameter Specification
Model / Part Number G772K620A (G772 K620)
Valve Type 2‑stage servo valve, spool & bushing
Pilot Design Nozzle‑flapper
Mounting Surface ISO 10372-03-03-0-92
Installation Orientation Any (fixed or movable)
Weight ~ 0.86 kg (1.9 lb)
Operating Temperature –40 °C to +135 °C ambient
Storage Temperature –40 °C to +60 °C
Vibration Resistance 30 g, 3‑axis, 10 Hz to 2 kHz
Shock Resistance 30 g, 3‑axis
Seal Material Fluorocarbon (FKM, Viton™ B)
Hydraulic Flow / Rated Flow According to G772-series spec: 1.9 to 57 L/min depending on variant
Max Operating Pressure Up to 350 bar (for certain models)
Electrical Signal Rated currents from 8 mA to 200 mA for G-series
Dynamic Response 100% step response: ~4–17 ms (depending on sub-model)
Frequency Response Typical: ~115 to 215 Hz (phase lag spec)
Special Features – High resolution / low hysteresis – Field-adjustable null bias – Fail-safe to center (zero input → zero flow)