The mini valve is a smaller version of the valve that I normally use. This smaller version is made for lower capacity system. Pump rating from 4 watt to about 12 watt are recommended to be use.
This valve is ideal for indoor set to be use as a teaching aids in schools.
Once the holes done, use hacksaw to cut the pipe in half.
Walla ! Put on the cap you have 2 bell for the grow bed.
Make the stand pipe with 15mm pipe, threaded tank adaptor and pipe adaptor. Use 32mm ~ 15mm pipe adaptor. Shown here the 25mm ~ 15 mm. 32 mm will give better siphon action with lower in flow.
How tall is the stand pipe, well its depend on your growbed. Ensure the bell and stand pipe match, the bell is taller than the stand pipe by about 1/2 ~ 1 inch estimate. Don't forget the 4mm drip hole on the stand pipe base.
Note : Stand Pipe is revised to 20mm with a 32 ~ 20mm adapter. This arrangement will tolerate better pump rating. The 15mm Stand pipe is just too small for a reliable operation. All else remain the same.
This is the complete assembly minus the outer strainer pipe. I use 83mm strainer pipe made out of sewage vent pipe and use the sewage vent cap to make it look better.
That's all. Outlet from growbed straight down about 4 inch then an elbow see my post earlier for picture. I don't use horizontal pipe after the elbow on this mini valve.
Below photo of strainer in the making, I use 82mm gray-water pipe.
A better close up, I only drilled 3 row of pencil size holes. I'm trying to get away with as few holes as possible. If there is problem with these I'll add 1 more row at a time.
The valve fully assembled and ready to use, normally I would glue the strainer pipe to the growbed to avoid it from being lifted up during usage.
Finally done, I would recommend that this valve is installed in center of grow bed. This installation shown below was due to reuse grow container so I don't have much choice. The valve is leaning to one side due to the container bottom.
On new gardening container I would make a hole in the center.
I redo the valve to center of grow bed and blank off the previous outlet, it looks much better and its not leaning any more to the sides.
I put Hydroton in this mini set, I need to test out Hydroton. I've tried it before but I did not like it. I need to check it again, maybe I am wrong the first time round.
This valve is for a low power system, it will work with low capacity pump. Don't use this if your growbed is large or the pump capacity is big, for that use its bigger brother.
Check : How to make Affnan's Valve