Water travels through the inlet end of the regulator and around a fixed seat into the critical flow area. The water then enters into a hollow cylinder called a throttling stem (or T-stem) which is attached to a larger diaphragm near the outlet end. A spring around the throttling stem tends to hold the flow area open, while water pressure acting on the total diaphragm area tries to close it. This duel always ends in a draw with the outlet (or regulated) pressure being determined by the spring’s compressive strength.
What does this mean to you?
Your sprinklers can only pass along what they receive. Give them consistency and they’ll return the favor. Most sprinklers perform best at a specific pressure level, often lower than your in-line pressure. But in-line pressure should be at least 5 psi (0.34 bar) higher than your regulator’s designed outlet pressure.
A regulator’s design and the materials used to manufacture it greatly impact its accuracy. Be sure to choose the regulator model that best fits the flow and pressure required for your application.
Senninger introduced the first quality in-line pressure regulator to the irrigation industry in 1966. Our regulators are 100% water-tested for accuracy and have a two-year warranty on materials, workmanship, and performance.