For what purpose would you use a gate valve?

A gate valve is specifically designed to control the flow of liquids or gases through a system. Its primary function is to allow or block flow, making it especially useful in plumbing and industry where precise control of fluid movement is necessary. The mechanism works by lifting a gate out of the flow path, which provides a straight line for fluid to pass through when fully opened, or completely obstructs flow when closed.

This distinguishes it from other tools and devices that serve entirely different functions. For example, tools used to square corners are for achieving right angles in construction or woodworking. Removing cartridge fuses pertains to electrical work, focusing on safety and circuit management rather than fluid control. Similarly, fastening wood to metal involves joining techniques and hardware, which do not relate to controlling the flow of liquids or gases. Thus, the gate valve's role in managing flow is the clear and definitive purpose among the provided choices.