You guys are on the same wavelength at the same time.I was just laying in bed lastnite researching various venturi designs as I wasthinking about spinning a few on my lathe to install on the supply lines of eachof my buckets.I already have massive pressure and flow to each one via a 3/8 poly line coming from a 1' schedule 40 manifold.I have dropped my res temps and ppm of solids to 1000 ppm and now have jumped to a whopping 10.5 ppm of dissolved oxygen in each root zone.I don't think a venturi will be necessary but hey,I never quit thinking.Making my own is the only way!Great post.Until tomorrow, when there is something better…. I'm sure any rigid product that will cure throughout its entire volume could work as well.1.3/4' PVC filled with epoxy2.Drilled 3/8' guide hole completely through then drilled both sides using a 'Step DrillBit' in a drill press or lathe3.3/4' PVC Venturi and Step Drill Bit4.Finished PVC Venturi5.Showing epoxy6.Outline shows the internal work within this VenturiAnd here is one made from a solid piece of acrylic to show inside dimensions. Often this just means you can grab a tube, and then grab the next size up. This means get something with an OD that equals another tube's ID.
They are also very clear, so you can watch the bubbles.The tools used.Drill and Drill bits (dulled edges for drilling acrylic).Heat gun (you could use anything that will heat acrylic up enough to make a soft place). materials:Acrylic tubing in sizes that slip over each other. These certainly can produce a perfect venturi, but most folks don't have those machines laying around.The purpose of this thread is to show how you can make nearly ideal venturis in any size or pressure ratio and flow requirement from just a few basic hand tools. Reservoir tanks and cloners can improve from the use of a good venturi.It's sometimes thought that to get the ideal shapes of a venturi, one would need to use a lathe, or a CNC mill. Bubble size would also be much smaller of course from being chopped up by a mesh or needle wheel as well.The Super VenturiVenturis are essential to the function of some important pieces of hydroponic equipment.
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