solenoid valve function through animation 

Yeah this is a normally closed valve. They have ones that are normally open. That way it's opposite, the valve is always open until the electrical current turns it off.

There are 'proportional' solenoids

Yes this is a on or off version

​@@bradmettler4566I'm trying to think of how an extreme pressure valve would work, maybe if the stopper was spherical instead of flat?

Kerala

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