I would like to use rain drainage of our house to fill up the pool, but not let the pool overflow. So i need a 3 way valve that is compatible with home assistant. Not a small valve as you can imagine.
#3-way valve recommendations?
thorn saffron
valid pecan
One note: it will almost certainly be easier to find a 2 way valve and use 2 of them - have one open up when the other closes and vice versa
Another option would be a single open/close valve that goes to the pool and arrange the plumbing so that the water all goes through that when open before going to the drain (e.g. if you imagine a U bend with the valve to the pool at the bottom)
As for options:
Off the shelf: this 2/2 valve goes up to 1" https://support.sinopetech.com/en/1.5.1/ which is the biggest smart one i've seen
DIY-y 3-way: something like this https://www.amazon.co.uk/Port-motorised-Valve-Ball-Three/dp/B07GCGFQ47 but you'd need to have a smart relay to direct the live to blue/brown to change the direction e.g. shelly plus 2 pm (https://www.shelly.com/en-gb/products/product-overview/shelly-plus-2-pm) though with most of those you'd need to be careful not to ever power both S1 and S2 at once as most people want independently controllable outputs not opposing outputs (don't think i've ever seen one with opposing outputs tbh) - might be safer to chain a smart relay with single output with a switching relay to give you your opposing outputs (https://uk.rs-online.com/web/p/power-relays/1217809)
thorn saffron
thank you! the idea to use a relay to control a basic non-smart valve is good!
valid pecan
This sort would probably be better actually: https://www.bes.co.uk/motorised-mid-position-valve-3-port-28mm-17392/ it has an end stop switch built into it which will make it much easier to drive properly