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I am thinking of building another project. This time I need to control liquid using a valve and electrical solenoid. What component can I use that will closely simulate a solenoid?

A couple of ideas to get you started.

You could try using the relay component.

Or use an inductor with a series resistance and then a current controlled switch to sense when the current in the inductor reaches an appropriate level.

If you want to look in more detail, have a look at this:

http://www.intusoft.com/articles/relaycd4.pdf

The article is not easy to follow though ...

:)