I checked the suppliers in Europe, in Asia, and in the Americas. No verified off-the-shelf valve meets all of it: 0 to 7 bar, 12 volts, about 10 watts, 5 milliseconds or faster, and an insulating wetted body. Pressure, speed, and an insulating body trade against each other. So there is no part number I can hand you today and say, buy this, it is done. What I can hand you is the closest match.
Research and experimental work, presented as Daniel's design ideas.
The full method is in The Donatelli Cycle ($7.99) — https://donatelli1.gumroad.com
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