What is a common use for valves in piping systems?

Valves in piping systems are primarily used to control the flow of fluids. This involves the ability to start, stop, or regulate the flow rate and pressure of liquids or gases within the system. By manipulating the valve position—whether fully open, partially open, or completely closed—operators can effectively manage the distribution of fluids and ensure proper functioning of the entire piping system. This capability is crucial in various applications, from household plumbing to industrial processes, where precise flow control can impact safety and efficiency.

While reducing pressure, supporting weight, or acting as connectors are important aspects in different contexts of piping systems, they are not the primary function of valves. Valves themselves are specifically designed to facilitate flow control, making this the most relevant and correct answer.