What does the valve position indicator (VPI) help to determine?

The valve position indicator (VPI) is specifically designed to provide information regarding the state of the valve, indicating whether it is open or closed. This is crucial in water and fuel systems where the flow of fluids must be controlled accurately. Understanding the valve's position allows operators to make informed decisions about system operation, maintenance, and safety.

While flow rate, valve size, and the type of fluid are important factors in managing fluid systems, they are not the primary function of a valve position indicator. A VPI directly communicates the operational status of the valve itself, which is essential for maintaining the integrity and efficiency of the systems in which it is installed.