It works with polarity one way to close and reverse polarity to open.
Ok have 2 x 12VDC supplies.
Can someone help me please as how to wire the 8 terminals on the switch?!
Very many thanks

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MadEngineer: Just be aware with that circuit, in reverse polarity that diode will be conducting and the relay will have 0.7volts across it.
Gordy
My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.
The OP's spec is changing. Originally DC was specified. Now AC is a requirement.
Hopefully the OP will get an idea of how to apply a DP change over relay to his application.
Gordy
My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.
andrewNZ: You're saying the valve is 12vdc and you want to control it with 230vac. Is that correct?
If so:
1) Your relay will not work. It will go bang.
2) The above diagram will work but do NOT put in the diode.
There is possibly a solution involving the gear you have, you need to tell us what your control concept is.
OK, after reviewing everything, this dodgy valve that you've purchased from aliexpress opens and closes by reversing the polarity connected to "RD" and "BK". The spec sheet listed specifies 12 volts for 15 seconds to completely open or close the valve. It also weirdly specifies "DC5V/DC12V/DC24V, AC110V-230V". I don't think that's correct (edit, probably is referring to whatever relay or control circuit you're using to drive the "actuator"). Ignore it as twice on that page is specified 12volts for 15 seconds.
You're going to need a timing circuit and another power source. That relay would be useful for switching the polarity (wired as a poor-mans H-bridge) for toggling between opening and closing the valve. This relay isn't for turning the thing on or off.
(edit, "Solar unit turns off when roof water cooler. Ok how to get a burst of power to open the motorised valve?!" suggests to have valve closed when water is cool)
That's the basic flow chart. Of course the relay switching steps only apply if its current status needs changing but that comes down to how you wire it.
You wire the relay on the normally open or normally closed position to suit which ever case the system is going to be sitting in the most so that the relay is driven for the least length of time.
you will need a couple of limit switches at the end of fully open and the end of fully closed in order to turn the motorised valve off otherwise the motor will keep on running against the end of travel and eventually burn out
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