I think 21 psi is correct.
I looked at FCP for OEM
https://www.fcpeuro.com/products/volvo-engine-coolant-recovery-tank-cap-30680002
I looked at IPD
http://www.ipdusa.com/products/7660/114349-expansion-tank-cap-p1-p3
Now the question -- is the cap in good working order?
The cap wiggles a bit when I push on side to side. It is suspect. The one on the S60 had male threads on the cap, it screws into the expansion tank and I can make it very snug.
The V50 cap is a female end and screws down onto the expansion tank neck. It has a stop point, almost like it is built into the cap. It just stops. You can't feel that there is not any torque being applied as it screws onto the expansion tank. It is the oddest thing I've ever seen but then maybe that is how it is to be?
Pulling the bottom engin cover to have a look below.
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