Which category of valve is typically used for on/off control in a water distribution system?

The butterfly valve is commonly used for on/off control in water distribution systems due to its design and efficiency. This type of valve features a rotating circular disc that allows for a straight flow of liquid when fully open and completely obstructs the flow when closed. It requires less space and can be operated quickly, making it suitable for applications where rapid operation is desirable.

Butterfly valves are also popular because they can handle larger diameters and higher flow rates compared to some other valve types, and they can be used in various pressure conditions. The straightforward mechanism of the butterfly valve allows for easy maintenance and operation, further solidifying its role in controlling the flow of water in distribution systems.