TC Blue Seal Practice Exam - Prep, Practice Test & Study Guide

An important characteristic of ball valves in a liquid process system is that they are generally more leak-tight when closed. Ball valves feature a smooth, spherical closure element that provides a tight seal when in the closed position. This design minimizes the possibility of leaks, allowing for secure handling of liquids, which is crucial in many industrial applications. The ability to maintain a reliable seal is essential for preventing loss of product and ensuring safety in the system.

The other options do not accurately describe the primary benefits or characteristics of ball valves. Creating high pressure drops when open is typically not a feature associated with ball valves, as they are designed to allow for minimal resistance to flow. Significant leakage under pressure contradicts the fundamental design advantages of ball valves, which are meant to provide effective sealing. Furthermore, limiting the use of ball valves solely to gas applications overlooks their versatility; they are widely used in both liquid and gas services. Hence, the characteristic of being leak-tight is pivotal in emphasizing their reliability and efficiency in liquid process systems.