What is the general term for a device that regulates the flow of water through a pipe?

The general term for a device that regulates the flow of water through a pipe is a valve. Valves are essential components in plumbing and various fluid systems as they control the flow and pressure of liquids, gases, and other materials. They can be opened or closed to start or stop the flow, and they can also modulate the flow rate, allowing for precise operation within the system.

Valves come in various designs and sizes, each suited for different applications, including gate valves, ball valves, and check valves, among others. Their importance lies in their ability to manage fluid movement effectively, ensuring systems operate safely and efficiently.

Other options are distinct devices that serve different functions. For instance, filters are used to remove impurities from water or other fluids but do not control flow. A reservoir is a storage space for water or other fluids but doesn't regulate flow. Regulators, while they can control pressure in a system, are not the general term for devices that encompass all types of flow control in plumbing; thus, a valve specifically describes the component that directly regulates flow.