people say you are capped with downstream injectors but I’ve seen a single unit with 2 feed lines or why not stack multiple injectors on each other to draw more chem?
venturi - bernoulli, I’m no scientist or math wizard.
Talk to @dperez as he is the resident wizard on DI and sells a purty good one
Those dual barb injectors only draw 50% from each barb… it’s not pulling double what a single barb injector would.
The ratio doesn’t change. Say it’s 10:1, even if you split the line and add multiple, you still end up at 10:1 for the final.
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If you pull from only one side on a dual barb it’ll be 10:1, if you pull from both sides of a dual barb it’ll be 20:1 from each side?
The venturi effect is part of the bernoulli principle, as I said before i’m not an enguneer nor a pysisctle. My very limited understanding is that if you put 10 DI on a line, you would not get 10 pulling at 20-1. Something like the law of diminishing returns, but they might have been placating me to get me to stop asking questions 
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An injector is only going to draw what the orifice and flow rate will allow. Doesn’t matter if have 1,2 or 10 barbs feeding it. Even if you split the line and run 2 injectors, you’re also splitting your flow rate, so the ratio remains
I’m in agreement with you, in terms running injectors in parallel… it doesn’t work that way. I was addressing the concept of the “single unit with 2 feed lines” that he mentioned.
Are you saying that a 10:1 dual barb injector with both barbs being feed 12.5% SH will put out 2.5% instead of 1.25%?
No, 10:1 is 10:1 output regardless of how many barbs feed it
So if you are feeding a 10:1 injector with two different products (SH and Surfactant) it’s pulling them both at 50/50… so wouldn’t that mean the SH is now hitting the wall at .625%? Thats why people use metering valves on the Surfactant side?
