I'm pretty new in this area so sorry if this question seems foolish.
I have a 12V 20Lpm Diaphragm pump that draws around 18 Amps. I'm using it on a home built herbicide spray system to help deal with the Spanish Heath that has fully taken over a good portion of my 50 acres.
I am really happy with the pumps performance though it is a little bit of over kill at 20LPM. I am toying with the idea of making a PWM circuit to control the flow. I was wondering if anyone has had any experience with this type of idea on a Diaphragm pump? I'm going to make up a pulse generator circuit out of a couple of 555 timers just to get me started. I was thinking about making it run from 100Hz to 1Khz with the duty cycle adjustable from 10-100%. I haven't been able to Google much about controlling flow with this technique and was wondering if anyone had any ideas on the best frequency to drive the pump at or even advise if the idea is viable? Perhaps I am better off controlling the flow with a valve at the output in which case I have posted to the wrong forum.