A flow control nozzle uses a flexible disk with a hole in the middle which allows maximum flow at the lowest pressures. As upstream pressure increases, the disk begins to flex forward, thus reducing the orifice diameter and restricting the flow. The thickness, durometer, and downstream support of the flexible disk all contribute to the amount of flow allowed to pass through the nozzle.
A flow control nozzle is simple and inexpensive, but much less accurate than a pressure regulator.
A high quality pressure regulator, when matched to the application, delivers a constant outlet pressure. This allows for optimum sprinkler spacing, uniform water application and a savings of both water and energy.
For more information about pressure regulators, contact Senninger Irrigation at info@senninger.com or visit www.senninger.com
For additional reading: “Flow Control Devices for Center Pivot Irrigation Systems” by William L. Kranz, Suat Irmak, Derrel L. Martin, C. Dean Yonts. 1988; Revised February 2007. Neb-Guide published by the University of Nebraska–Lincoln Extension, Institute of Agriculture and Natural Resources. http://www.ianrpubs.unl.edu/epublic/live/g888/build/g888.pdf
“You can really see the uniformity reflected in the crop. I like the mini-Wobbler because it’s easy to use and lasts a long time,” says Gary. The Vans Pines Nursery reputation relies on their crop. Gary relies on the Senninger mini-Wobbler to help him maintain that crop.”