Can I add 3/4" inline pressure regulator+filter at start of 1" sprinkler system?
I have a question that involves a functional component and and a sprinkler component. Background: I am converting one of my existing 1" sprinkler system lines into a 100% drip line. I will be converting 3 downstream sprinkler heads into 3/4" drip line (2 into drip, 1 sealed) and will be adding a 3/4" T-split to add a drip line off the main line. My water PSI is about 100 at the source. I was going to place an inline pressure regulator + filter at the start of the entire line. I bought the 30PSI regulator, which is 3/4". So the line would go Source/solenoid --> 1" --> 3/4" --> 1" --> rest of drip line. FYI, the total length of the line from start to end would be about 150' with three drip line extensions, each about 20'.
First, is the use of a 3/4" inline regulator ok in this case or should I increase to the 40PSI 1" regulator?
Second, I'm not sure which thinking is correct: On one hand, going from 1" to 3/4" would drop flow and should increase pressure. But then pressure is being regulated. Would flow decrease even more after 3/4" to 1" increase? Or would any change in volume be functionally non-existant?