Any ideas on how to automate this valve? This is for to fill manually my pool. I would like to simply either schedule to open or do it on the demand via HA.
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Something like this connected inline with the pvc out to pool. Controlled by esp relay.
Use a magnetic Valve (like from railbird) , I use them for irrigation, works quite simple
Water solenoid valve should do the trick, using same as a sprinkler system. Usually rated for 24volts at low current. Bonus, valve will fail closed in case of power interruption. Be sure to make reliable plumbing connections, not just gardening hose clips. Pick a solenoid valve the same inside bore as the existing gate valve to maintain optimum filling times with best water flow. Switch it with a relay board or smart switch connected to a mains transformer wallwart to power the solenoid. Keep the electrical stuff inside if possible, or put it all in a waterproof enclosure, with just the two wires going out to the solenoid valve.
While you are there playing with the plumbing, why not automate your watering system as well? Another switch/relay, another solenoid, but you can use the same power supply.