Final answer:
The statement that plug valves are not quick-opening valves is false. Plug valves allow for fast operation with a simple quarter-turn motion, contrasting with other valves like gate or globe valves.
Step-by-step explanation:
The statement 'The plug valve is not a quick-opening valve' is false. Plug valves are designed for quick operation, allowing for a full flow or stop of fluid with a quarter-turn motion of the valve handle. The design of plug valves includes a simple plug mechanism that can be easily and swiftly rotated to open or close the valve, making it suitable for applications that require fast actuation. They contrast with gate valves or globe valves, which typically require multiple turns to go from open to close.