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RNG: 2.4 KM
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ALT: 3,200 FT
SPD: 480 KTS
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STATUS: LOCK
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    Hysteresis in Hydraulic Valves

    Measurement, Limits & Engineering Significance

    1. What is Hysteresis?

    Hysteresis in hydraulic valves refers to the difference in output for the same input depending on whether the signal is increasing or decreasing. It indicates a memory effect in the system.

    Hysteresis = Difference between rising and falling response at the same input.
    • Spool friction
    • Magnetic effects
    • Seal deformation
    • Internal leakage
    Hydraulic valve hysteresis loop
    Typical hysteresis loop showing different output paths for increasing and decreasing input.

    2. Measurement on Test Bench

    • Input Sweep: Gradually increase signal
    • Reverse Sweep: Decrease signal
    • Plot Curve: Input vs Output
    • Calculate: Max deviation

    Hysteresis is expressed as % of full-scale output.

    Hydraulic valve test bench
    Hydraulic valve test bench used for input-output sweep and hysteresis measurement.

    3. Acceptable Limits

    Valve Type Hysteresis Application
    On/Off Not critical Binary operation
    Directional 5–15% General systems
    Proportional 3–10% Controlled flow
    Servo <3% Aerospace precision

    4. Why High Hysteresis is a Problem

    High hysteresis acts like a deadband, reducing responsiveness and control accuracy.

    5. Test Bench Identification

    Explore Valve Test Bench

    Advanced systems for precise hysteresis measurement.

    View Product

    Conclusion

    Hysteresis directly impacts hydraulic system accuracy and stability. Measuring and controlling it using advanced test benches ensures reliability in critical applications like aerospace and heavy machinery.

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