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Robinair 40288 Line Piercing Valve for 3/16", 1/4", 5/16", 3/8" OD Tubing

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I've been looking through my HVAC textbook between semesters and read that piercing valves should be removed once system access is no longer needed. This of course goes for the non-permanent type but my question is, how on earth do you remove a piercing valve and not lose your refrigerant? What am I missing here that the textbook does not cover?

Thread one end of the supply line clockwise to the shutoff or piercing valve under the sink and tighten until snug with the adjustable wrench. If you are using a plastic or copper line, you will have to first slide on a compression nut followed by a compression ring or sleeve onto the end of the line. When using stainless steel braided supply lines, a built-in rubber gasket prevents the connection from leaking.


Piercing Valves - Century Tool & Equipment

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