Nozzles & Down Stream Injector

M

MDProWash

New member
Rainy day.. so out piddling in garage with equipment. I was testing the pressure on my 4.5gpm/3500psi machine with 200' of hose and noticed that with the injector inline that the psi with a 0040 or 2540 tip was around 1200. With the injector taken out of line the psi drops to 500. I have a few questions... Is the increase in pressure with the injector inline due to back pressure it creates? I soap and rinse with the same tips... so I pull my line from the bucket when I'm rinsing.. how does sucking air affect the injector? Am I loosing water flow while the injector is sucking air? If so.. I think I'm going to install an injector bypass. I'm looking at a nozzle chart and it says a #40 tip should only be about 50psi yet it clearly says 500 on my gauge? Why?
 
The injector has a small orifice which increases pressure and decreases flow. That's how an injector works. Needs to increase the pressure at the front end to cause lower pressure at the back end to create a venturi effect(vacuum). You ARE losing flow while the injector is inline, whether you pull the line out or not. If you pull the line , you will lose a bit more flow that would have been the chemical. Invest in an injector bypass kit and you won't have to worry about it.
 
Tom, I don't have a bypass kit (yet) so I have a bucket of water next to the chem bucket. When I pull the injector out of the chem bucket, I place it in the water bucket. It will save a little bit of pressure, not as much as a bypass, but it will help.
 
About ds. Will gravity feeding the injector help increase solution flow? Say the solution tank was mounted directly over the injector?
 
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