How to Identify a Bad Pressure Regulator

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Date: 
Tuesday, August 18, 2015

For years, growers have asked irrigation manufactures “How can I tell if my pressure regulator is bad?” and the industry has always responded with “Well, it’s not that easy.”

The most common signs of bad or faulty pressure regulators include:

  • Leakage between the device’s housings
  • Misting or overwatering in some areas
  • Increased water and energy consumption
  • High-pitched squealing

These symptoms are easily spotted during a visual check of the system or noticed in unusual flow meter readings. Common signs in the field are dry spots near the head, overwatering in a doughnut-shaped pattern, uneven crop growth and streaking in the field. 

The best time to visually inspect your system is early or late in the day when the sun is low as differences between sprinklers are easier to identify in this light. 
 

Why Good Regs Go Bad

The conditions under which pressure regulators operate influence their lifespan. Anything with moving parts wears over time, and pressure regulators are not different. Though regulators last for years, the degree of regulation will change over time as internal parts wear.


Poor Water Quality

Water quality plays a significant role in the lifespan of pressure regulators. Surface water sources may contain grit and fibrous matter. Over time, suspended abrasive materials cause wear on the seat and the end of the throttling stem which alters regulator performance.

Some surface water sources contain chemicals from runoff, including petroleum, which can cause damage to pressure regulator components. Systems using well water with high iron content see rust buildup on and in the components.

These installations should employ filtration to help assure proper performance of the regulators and the sprinklers. 


Long Operating Hours

Regulators installed on systems that run for long hours throughout the season will wear faster than those on systems that run for fewer hours. The internal moving components operate differently as each begins to wear.


Unflushed Chemicals in the Pipeline

Irrigation systems are frequently used for chemical applications. Chemicals like nitrogen, fertilizers, and solutions used to combat insects and weeds can cause damage to internal regulator components.

It is best to flush the system after each chemical application to prevent residue from resting inside the regulator.

 

An In-Depth Look at Troubleshooting

Learn how to identify wear issues and what to do about them with Senninger's free on-demand Pressure Regulation course on Hunter University. You'll learn how to install pressure regulators in different irrigation systems, select a model, identify the causes of pressure fluctuations and more.

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