What type of valves can be opened or closed by rotating a handle a quarter-turn?

Butterfly valves are designed to be opened or closed by rotating a handle a quarter-turn. This design allows for quick and efficient operation, which is especially beneficial in emergency situations where rapid flow control is needed. The quarter-turn movement significantly reduces the time required to fully open or close the valve compared to other valve types, making it a commonly used component in fire protection systems.

In the case of butterfly valves, the rotational movement is translated into the position of a disc within the valve body. When the handle is turned, the disc pivots away from the flow, allowing fluid to pass through, while turning it back results in the disc blocking the flow. This simplicity in design promotes reliability and ease of use for firefighters in urgent circumstances, highlighting why butterfly valves are preferred in many firefighting applications.