A BW Power Plant Valve refers to a valve used in power plants, featuring butt-weld connections made by welding the beveled ends of the pipe and the straight end of the valve together. These valves prevent over-pressuring, ensuring safety for people, the plant, and the environment. They are often shut-off valves, also known as isolation valves, including ball valves, gate valves, and butterfly valves, which control the flow of process media.