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.
2000 WOG meant 2000 psig cold working pressure rating in Water (W) Oil (O) or Gas (G) service.  Likewise 1000 WOG means 1000 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 gate 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.

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