Hello all, I was wondering if the forum knows of the meaning of Valve markings, the reason why I'm asking this, purchased solonoid actuated Ball Valve, the previous Valve had markings "2000 WOG", which to me means rating 2000Kpa Water or Gas.The new Valve arrives its marking on the side states, "1000 WOG", which to me means 1000 Kpa rating.Phoned supplier, supplier states good for 4000Kpa, Ok installed Valve, Guess what Valve leaks, System running at 2300Kpa.Purchased another Valve again Marking on the side states "1000 WOG", Supplier states good for 4000Kpa according to their books.my question is what the hell does "1000 WOG" Mean? WOG is an old acronym for Water Oil Gas. Others can provide some additional details. Use the ASME B16.34 or other standard rating system to assure that the valve material and rating is suitable for your application. As stated by JLSeagull, WOG stands for water-oil-gas. It should intend the same as CWP (Cold Working Pressure), that is the maximum pressure rating allowed under normal "ambient" temperature conditions, -29