Help building a PVC bypass valve for venturi pump
My posting in the tomato section received the suggestion that I post here.
I'm looking to build a water bypass valve from PVC and parts from HD/Lowes to use with my fertilizer my tomatoes and peppers, etc. (a mazzei-type venturi pump)
A bypass valve splits the hose water either fully or partially and then rejoins the streams (one of the sides has a ball or other type full/partial shutoff valve) - one of my splits will have a venturi fertilizer 'pump'. See the picture at the bottom for a 'basic' unit in which the venturi pump is locked down (ie not quite what I want).
So, anyone have a parts list and directions - visually it's easy to see, but the fittings, etc. are easy to get wrong. I don't know, for example, what the various connectors create as offsets for the lengths I'll need.
One side difficulty is that I want the venturi side to have a replaceable (varying) length tube with connectors on both ends since my sample ABS venturi pumps are different sizes. The venturi will connect to a fixed end (screw connectors) and then there will be a 'stub' with screw connectors on both ends - the stub will have replacement stubs such that the correct pair (pump/stub) will fit the opening.
I'm hoping to find PVC connectors that screw on - like a hose - rather than turning the ABS pump (which won't work since it needs to be connected to both ends. One section (the stub) will be removable since the various units are different sizes.
My googling didn't pick up any plans or diagrams - which seems really weird since this should be an afternoon project for anyone with a PVC cutter.