Soap Injector physics

carolinawildcat said:
That is good info, but if we aren't using a shutoff, how much flow do we lose if the hose is placed in a bucket of rinse water, or, in a pinch, simply pulled out of the soap completely?
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That depends on the injector size and flow of your machine. I lose quite a bit on my 5.5 gpm machine. It looks like at least 1 gpm is being bypassed, maybe even 1.5, IDK.
 
Pat Norman said:
I'm definitely getting ready to build one of those bypass rigs this week. It gives me a LOT more flow rinsing when not going thru that tiny injector PLUS it is a lot easier on the motor and pump. Less back pressure between the pump and injector.
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Pat, this thing works perfectly. I thought that the injector would kick in when I used low pressure, but it doesn't. Gonna put a three way poly valve on it next like Matt said, just for added security.
 
Ralph Q said:
Pat, this thing works perfectly. I thought that the injector would kick in when I used low pressure, but it doesn't. Gonna put a three way poly valve on it next like Matt said, just for added security.
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Yeah I knew when it went in bypass with that ball valve open it would not draw soap. I am debating whether to put the injector on the loop and have the ball valve between the Tee's or do it just like the picture. Either way should work but I'm afraid the injector may not work as good on the loop due to all the 90 degree turns.
 
I built mine today. Added some quick connects between the Tee's so I could change injectors quickly. I tried to use stainless Tee's and nipples but I miss figured and had to use some other nipples I had too. Wish I'd ordered shorter nipples too but it should be fine. Can't wait to try it out.
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Chris Francis said:
Can some one explan that bypass the injector works and why are you bypassing injector that way
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For rinsing. Look how little that orifice is. You either have to take the injector out or be lazy and leave it in and pull the soap line out. With the bypass you get full flow rinsing much better and faster and also is so much easier on the pump and motor and gas usage in bypass. All with a simple twist of the ball valve. If you have a pressure gauge mounted near your pump look at the pressure it registers with an injector vs without an injector with a #40 orifice like I rinse with. That will convince you. If those qc's were ever half as easy to use as they should be it wouldn't be such deal but it is for us.
 
Pat, that thing is so huge you need a guy just to hold it. hahahahaha j/k

I would take out all those pipe nipples and just get the mpt plugs/couplers to connect to the injector and "T"'s and that thing will be a lot smaller, almost 1/2 as big.
 
I like this idea. So the water flow takes the path of least resistance? Which means the restriction of the tiny hole in the injector is more restriction than the 90 degree elbow.
Also, could the hose be replaced with galvanized steel and elbows,..or would that cause too much restriction?..maybe bump up to 1/2" fittings? Was thinking it would save a little space. Is everyone who's using this experiencing the ability to rinse with a soap nozzle and NOT pulling soap? Or do you still have to pull the soap line out of the bucket? Input from users appreciated!!

Jeff
 
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The water will still be going thru both circuits when the ball valve is open. But the injector will not suck one drop of soap because the pressure will now be equalized on both sides of the injector. There won't be a pressure differential on the downstream side so no venturi effect to make the injector draw. And now for rinsing you have a nice full 3/8 circuit for the water instead of 2.1 mm. BTW 3/8 in is 9.525 mm which in area of the size of the hole with pi is probably around 12 times larger just doing it quick in my head.
 
You're right on the making it fit,.. I think I can tweak it together, Ha,Ha,.. and I think I can overcome the rigidity with the use hydraulic swivels or even quick couplers. Would only have to remove one side I think. I'm over thinking again,Ha,Ha,..

Thanks for the input Pat!

Jeff
 
Wow Pat that's a lot of extra hardware. I just asked Bob at pressuretek to send me the ingredients, and the showed up at my door in three days. I have QC's on the injector too. Their are two different tee's. One with three female, and one with two females and a male to go to the ball valve. Here's the parts list I have.
 

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Well I like this configuration a lot better and I will still be able to change injectors quickly. I put the swivel on the whip hose right by the injector so two quick turns of the wrench and the injector is out. Also now when it is in high flow bypass the water has a straight shot.
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Oh the way mine is setup the water enters on the female QC side.
 
Pat Norman said:
And now for rinsing you have a nice full 3/8 circuit for the water instead of 2.1 mm. BTW 3/8 in is 9.525 mm which in area of the size of the hole with pi is probably around 12 times larger just doing it quick in my head.
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My quick math was way off the area of a circle 3/8" is around 19 times greater than 2.1mm circle.
 
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