The over pressure valve is to avoid explosion by releasing excessive pressure.
CO2 tanks use 800 psi, and maintain it about until its all used up.
The noise is typically noticeable if it blows, and, again, while scary, is not dangerous, assuming you don't drive off a cliff in fright, etc.
_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
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