Hi
I wanted to connect this electric valve with following circuit to my Arduino Uno.
Anybody can give a idea about pin connection to Arduino
You could use a relay to connect the green wire to the (external) 12VDC supply.
It's possible to do this with one or more transistors as well, but it depends on the implementation of the device and the page you linked to isn't clear on this. A relay (even a small one) will certainly work and is relatively easy to use. There are relay modules you could use for this.
From reading the page I get the impression that the GREEN cable is only for a 12 volt command signal and maybe with a suitable optocoupler it will do the control.
That's correct.
@jim-p's suggestion should work.
I recommended a relay because they're omnipresent in the hobby domain and virtually everyone can figure out how to use one. It's a decent compromise but technically not necessarily the best solution.
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I will try with a relay, first.
Thank you