4 inch ball valves are quarter-turn valves that use a spherical ball with a central bore to control fluid flow through the pipeline. These valves are designed to provide tight shutoff, making them suitable for medium to high-pressure systems where reliable isolation is required. Their compact design and smooth operation allow for quick opening and closing with minimal pressure drop. Common applications include water distribution systems, chemical processing plants, oil and gas pipelines, HVAC systems, and industrial manufacturing processes.