Hi there ,
Can anyone point me in the direction of a venturi airator diagram?
I hope that question made sense,!
Kind regards, Skipd.
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| Venturi airator http://byap.backyardmagazines.com/forum/viewtopic.php?f=8&t=8260 |
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| Author: | skipd [ Sep 26th, '10, 10:34 ] |
| Post subject: | Venturi airator |
Hi there , Can anyone point me in the direction of a venturi airator diagram? I hope that question made sense,! Kind regards, Skipd. |
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| Author: | skipd [ Sep 26th, '10, 11:34 ] |
| Post subject: | Re: Venturi airator |
disregard post, just found great diag on hardware forum. 
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| Author: | BlueThumb [ Sep 26th, '10, 11:50 ] | ||||
| Post subject: | Re: Venturi airator | ||||
Oww - In answer to your call out, I braved the outdoors for some photos ... Oh well *sigh* here you go all the same!
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| Author: | BlueThumb [ Sep 26th, '10, 11:54 ] | |||
| Post subject: | Re: Venturi airator | |||
...more
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| Author: | BlueThumb [ Sep 26th, '10, 12:00 ] |
| Post subject: | Re: Venturi airator |
They are pretty rudementary efforts, Skipd, but very effective. Having the venturi inline from GB to FT has meant that I can submerge my GB waste pipes within the FT without it affecting the equalisation pressure of my autosiphons - meaning that I have *almost* silenced any water noises, other than the occassional 'gurgle' as the autosiphon completes its cycle. These venturis would have cost $2.50 to make - just the cost of a T from 'B'! There are plenty of other ideas around - your man Pete (pjenkyn) has a nice little model using a pipe end cap as the venturi tooth, and there is a few eeb pages dedicated to venturis - one in particular can be found here Good luck mate! BTx |
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| Author: | earthbound [ Sep 26th, '10, 12:10 ] |
| Post subject: | Re: Venturi airator |
Venturis come in so many different shapes and sizes don't they.. Almost as much fun as siphons. We use a couple of 40mm - 25mm reducing bush's to reduce the size of the pipe, then drill a 3mm hole in the short piece of 25mm pipe. Works surprisingly well, you would think that water would squirt out the whole, and sometimes a little bit does when the pump first starts, but after that it sucks in lots of air.. Attachment: IMAG0028 (Medium).jpg [ 60.28 KiB | Viewed 2548 times ] |
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| Author: | BlueThumb [ Sep 26th, '10, 12:13 ] |
| Post subject: | Re: Venturi airator |
Ah yes, EB - that's the priciple of [expand -> reduce + add air/tubulence <- expand], right? Even easier! |
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| Author: | earthbound [ Sep 26th, '10, 12:22 ] |
| Post subject: | Re: Venturi airator |
Yeah I think it works on the same principle as an aeroplane wing, faster flow through the smaller pipe means a drop in pressure, so it suck in air.. I know some old carburetors used similar principles. |
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| Author: | Hillsy [ Sep 26th, '10, 12:49 ] | ||
| Post subject: | Re: Venturi airator | ||
I use a 16mm end cap upside down inside a 25mm T piece with a 13mm hole in the backside away from the direction of flow. Its the second design I have tried, got the design from another member (Pete) and it works unreal. Have it running on the inlet from the pump down to the bottom of the tank, about a meter down and it pumps a lot of air into the water, bubbles all the way to the top. viewtopic.php?f=18&t=8151
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| Author: | Jamey [ Sep 26th, '10, 12:54 ] |
| Post subject: | Venturi airator |
I made one yesterday with a 20mm PVC T and a 19-13 poly reducer in the in end seats in perfectly plenty of bubbles. |
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| Author: | skipd [ Sep 26th, '10, 20:09 ] |
| Post subject: | Re: Venturi airator |
Cheers for the pics and info BT.  I got to it and used what I could to make my own airator, watch this space for what might just be the dodgyest airator yet.  gave it a trial run this arvo and seemed to work. leaving overnight for silicone to dry then will give it a run tommorow.  Ps the underwater bubble pic looks way cool. 
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| Author: | skipd [ Sep 27th, '10, 07:51 ] | ||||
| Post subject: | Re: Venturi airator | ||||
Well silicone went off overnight and I reinforced with a bit of electrical tape. Put in line and hey presto. Must give note to Stevesmartt for inner cut out detail, basically wedge cut in bottem of tooth. Wired paver offcut to end of outlet to hold it underwater, you can just see it in pic. Outlet is about 2 feet under water. Tooth is 13mm, main line is 19mm.
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| Author: | skipd [ Sep 27th, '10, 07:56 ] | ||||
| Post subject: | Re: Venturi airator | ||||
Some seeds have germinated, not sure what they are but will have fun guessing. Other pic with airator and tap on.
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| Author: | BlueThumb [ Sep 27th, '10, 09:07 ] |
| Post subject: | Re: Venturi airator |
Looks the goods! Just keep an eye on the paver in the FT - I had an unsealed brick in mine and it leeched something alkaline and bumped my pH skyward! Best to use a piece of riverrock or granite or an errant child. BTx |
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| Author: | earthbound [ Sep 27th, '10, 12:24 ] |
| Post subject: | Re: Venturi airator |
Nice subtle toe work skipd.... What are the small berries on the ground? They look almost like small olives, but it's not olive season yet... |
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