what the acronym CWP means when used to describe a ball valve?
See the ball valve description below taken from a BOM.
BALL VALVE, 1200CWP, 700PSI  350F,  200PSI  400F, SW.,A350-LF2, CL 1., /-, RTFE SEATS, REG. PORT, L.O., 100% RT ON BW FOR FORGED VALVE., W/ 2 PE PIPE NIP.
Reference to the abreviation "WOG" is made in MSS SP-25 (in my 1998 Ed. it's a note to Par. 4.1.3).
"WOG" (water, oil, gas pressure) is said to correspond  to "CWP" (Cold Working Pressure). CWP is the maximum pressure rating allowed under normal "anbient" temperature conditions, which are usually understood to be -29°C to 38°C.
As per MSS SP-25 "WOG" does not correspond, however, to "WSP" (Steam Working Pressure).
MSS recommend to consult the applicable codes, standards and  manufacturer's data sheets.

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