Quote:
Originally Posted by gtojohn
Why remove the valve core on king valves with flare fittings? I remove valve cores before I braze to protect them from the heat.
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Somebody somewhere long ago recommended to remove the valve cores to speed the evacuation process. The train of thought is that with a bigger hole, one can move more gas in and out faster. Especially when one is using a large displacement vacuum pump, on a large commercial multi-zone system, the large pump and a coreless valve can pull a pretty deep vacuum in a jiffy.
I myself only pull valve cores if I have to. As long as the thing doesn't leak, I'm happy with taking a few minutes extra to get there. I do change the o-rings in the cover caps most every time, though.