The Industrial DBB Plug Valves segmentation by type is dominated by four principal configurations: Ball Plug Valves, Gate Plug Valves, Knife‑Gate Plug Valves, and Multi‑port Plug Valves. Ball Plug Valves employ a spherical disc that rotates to open or close flow, offering rapid actuation and low torque, which makes them suitable for high‑speed line‑turning in petrochemical plants. Gate Plug Valves use a linear stem to lift a wedge‑shaped plug, delivering tight shut‑off and minimal pressure drop, thereby contributing significantly to the market share in oil‑field pipelines where leakage tolerance is low. Knife‑Gate Plug Valves feature a sharp‑edged blade that slices through viscous media, capturing niche segments such as slurry transport and wastewater treatment, adding a modest but strategic portion of overall revenue. Multi‑port Plug Valves incorporate multiple inlet/outlet ports within a single body, enabling complex flow routing for process control systems; their versatility drives adoption in chemical processing facilities. Collectively, these types account for the full market size, with each sub‑segment’s proportion reflecting functional fit and cost‑performance trade‑offs across industrial applications.