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Operational Characterization of Pressure Regulating Valves.

M V Talamini Junior1, A C S de Araujo1, A P de Camargo2

  • 1Biosystems Engineering Department, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo (USP), Piracicaba, SP, Brazil.

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Summary

Pressure regulating valves (PRVs) ensure uniform irrigation on sloped terrain. This study models PRV performance, accounting for inlet pressure, flow rate, and hysteresis, to improve irrigation efficiency.

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Area of Science:

  • Agricultural Engineering
  • Fluid Mechanics

Background:

  • Pressure regulating valves (PRVs) are critical for uniform water distribution in center pivot irrigation systems.
  • Sloping terrain exacerbates pressure variations, impacting irrigation efficiency and uniformity.
  • Existing PRV performance models may not fully capture operational complexities like hysteresis.

Purpose of the Study:

  • To evaluate the operational characteristics of PRVs according to ISO 10522 (1993) standards.
  • To develop models predicting regulated outlet pressure as a function of inlet pressure and flow rate, incorporating hysteresis effects.
  • To assess the impact of inlet pressure and flow rate on PRV performance and uniformity.

Main Methods:

  • Experimental testing of three PRV models (10, 15, 20 PSI) under varying inlet pressures (49.03–784.53 kPa) and flow rates (0–4 m³ h⁻¹).
  • Evaluation of regulation uniformity, regulation curve, and hysteresis under increasing and decreasing inlet pressure conditions.
  • Data analysis to fit predictive models for outlet pressure based on inlet pressure and flow rate.

Main Results:

  • PRV outlet pressure is influenced by inlet pressure, flow rate, and hysteresis, deviating from ideal regulation.
  • Hysteresis effects were quantified, showing differences in performance under increasing versus decreasing inlet pressures.
  • Predictive models were developed to describe the relationship between inlet pressure, flow rate, and regulated outlet pressure.

Conclusions:

  • Accurate modeling of PRV performance, including hysteresis, is essential for optimizing center pivot irrigation on varied terrain.
  • The developed models provide a basis for improved system design and operational control for enhanced irrigation uniformity and efficiency.
  • Adherence to ISO standards is crucial for evaluating PRV functionality in agricultural applications.