Quote:
Originally Posted by cl8ton
Jacob, thanks for posting and welcome aboard!
Spring in, I can barely get the valve to move. I’m not a girly man, but dam I’m sure I can bench press 1bar=14.5psi (unless my math is whacked) 
Spring out, everything moves silky smooth.
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If you open the spring can you will see the spring fly out with considerably more than 14lb compression force, The spring is holding about 120lb force from memory. Which is why you can't push it open. I have measured it by compressing in my press to normal can length, on bathroom scales. Depending on your spring - you are in the 120 lb region of compression pressure. A 1 bar spring would be near 150 lb, ie about the weight of a slim adult. You won't be pushing that open with your thumb.
Alan