Browse Forums Landscape & Garden Design Re: How can I inject powerfeed, seasol into my sprinklers 10Feb 05, 2011 6:39 pm ---- Building in Banksia Grove We have keys - 31st March 2011 Re: How can I inject powerfeed, seasol into my sprinklers 12Feb 05, 2011 10:31 pm ---- Building in Banksia Grove We have keys - 31st March 2011 Re: How can I inject powerfeed, seasol into my sprinklers 13Oct 26, 2014 10:47 pm Sorry for pulling a necromancer on this topic/thread, but hopefully there is experience that can be shared by someone. Unfortunately I don't have experience with venturi systems (yet) and so I have few a questions about the photo from FU showing the configuration of a "bypass venturi" with an "in-line/main-line valve". From my understanding there are various possible configurations for venturi systems (bypass, serial, parallel, pump assisted, etc.) and selection of which to apply requires consideration of what the water pressure differential is between the inlet and the outlet, which is effectively what causes the venturi to "suck up" the fertiliser. Now, if I understand it correctly, you could potentially use a venturi injector in an in-line/main-line configuration (i.e. directly) provided the pressure loss caused by the venturi itself doesn't impede the operation of the actual irrigation system? Right? Continuing my assumptions, if there is too much of a pressure loss when used in-line, one of the alternatives would be like the above pictured where there is a "bypass venturi" (ie. it bypasses the main-line where the ball valve is) and forces the flow via the venturi. Hopefully I'm not on too much of a tangent here, but am I correct in understanding that the valve in the mainline would typically be used in a partially closed position to still allow pressure through the mainline? This would then still have the venturi operate but the pressure from the partially closed main-line helps to alleviate the implicit pressure loss from the venturi segment? Right? Is that how it works? What happens when you don't want to inject anything - will water not still flow through the venturi unit... oh wait right, that's why you've got that pluggable solution - you just disconnect the two blue-capped bits? What I'm driving at is I'm trying to figure out whether I can use a 25mm venturi (like this one http://www.ebay.com.au/itm/1-Irrigation-Venturi-Fertilizer-Injectors-Device-Water-Tube-Switch-Filter-Kit-/161009190553?pt=LH_DefaultDomain_15&hash=item257ce54699) in-line on my 25mm (blue poly) main-line pipe or if I need to use the bypass method (I have space constraints for the latter which might mean some more work ) Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Thanks! I use Tramex moisture meter and it will tell me instantly if the wall is cement sheet or plaster or masonite but most people dont have the equipment. 5 7094 the step up is 30mm and wanting it to be flat . how much does the concrete have to be lowered .we plan on removing bath and lenghten shower and adding seat. the old bath… 0 11838 8 6156 |