It's expansion, it's a complicated valve that acts like a throttle to meter refrigerant flow in to an evaporator. It's too complex to fully explain in a forum, I suggest you Google it.
If you need to ask this type of question, you should not attempt to touch it, it could be dangerous for you and or anybody around you. It operates by FM (Fµ¢k'n Μàgi¢)
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Expansion Valve
Re: Expansion Valve
