Ball Valve | 1000 WOG | Stainless Steel - Trupply

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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 " WOG", which to me means rating Kpa Water or Gas.
The new Valve arrives its marking on the side states, " WOG", which to me means Kpa rating.
Phoned supplier, supplier states good for Kpa, Ok installed Valve, Guess what Valve leaks, System running at Kpa.

Purchased another Valve again Marking on the side states " WOG", Supplier states good for Kpa according to their books.

So my question is what the hell does " WOG" Mean? WOG meant psig cold working pressure rating in Water (W) Oil (O) or Gas (G) service. Likewise WOG means psig in water, oil or gas service.

ASME and API do not typically use ratings like this. They more commonly refer to pressure classes such as Class 150, Class 300 and Class 600.

The rating of the valve is only one aspect to consider and the other is the quality of the components and design. Just because two different valves have the same cold working pressure rating does not mean that they are going to be of equivalent design and performance. You might want to look at what design and manufacturing standard was used and you may find that some valves might be designed to an MSS standard whereas others to an API standard and still others to an ASME standard. There can be different requirements in these different standard and different manufacturers may invest more into their product and go above and beyond the minimum requirements.

You might want to consider specifying that the valve has to have passed API 598 leak testing as one means to try and assure reliable leak tight performance. "You might want to consider specifying that the valve has to have passed API 598 leak testing as one means to try and assure reliable leak tight performance"

So if I'm testing Valve leakage on a closed testing circuit, the Valves I required to seal the system for testing need to be API 598 rated, I can't have any air passing through the Valves at all when shut, if air passes through any of the valves that seal the circuit, the bubbles in the testing vessel will continue giving a false reading.
Is this the case Further to the leakage classification, consider there are six different seat leakage classifications as defined by ANSI/FCI 70-2 (R).

Take a look to the link below


Please consider that a valve is tested under precise conditions and then it is rated to the relevant ANSI standard. If your working conditions are different from those of the test, the valve perform in a different manner. So be as clearer as possible when defining your working conditions to your valves’ supplier.