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You'll need to be more specific, since valves are used in many different applications.

What type valves are you posting your inquiry?

Since the topic is under "new electrical work", one might assume that you are asking about electrically operated valves or valves with position sensors, or you may be asking about the old "vacuum tubes", which in much of the world are referred to as "valves".

Answering all of those questions would end up being a dissertation, and probably more than would be appropriate for Answers.com

The valves of the heart prevent the blood that is pumped out from flowing back to the heart or backward in veins.

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Q: How do the valves work?
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