What is constituted by 'quick opening' valves?

Quick opening valves are defined by their ability to operate with minimal rotation, allowing them to open and close rapidly. This feature is critical in systems where immediate adjustments to the flow of fluid are necessary, such as in control applications where quick response times are essential for safety or operational efficiency.

These valves are designed to minimize the time it takes to execute a full action, contrasting with valves that may require several turns or prolonged actions to open or close fully. The quick opening feature benefits processes that involve fluids needing to start or stop promptly without significant delays, which can be crucial in mechanical and industrial applications.

The other options are distinguished from the characteristics of quick opening valves; for instance, a valve that takes time to react would denote a slower mechanism, which is contrary to the purpose of quick opening valves. Similarly, those that operate with a full turn often indicate more traditional valve designs with slower, deliberate opening and closing actions. Lastly, general plumbing systems may utilize various types of valves, but not all of them are designed with quick opening features in mind, further illustrating why the minimal rotation characteristic is the defining trait of quick opening valves.