Which valve is operated by rotating a handle one-quarter turn?

The butterfly valve is designed to be operated by rotating a handle one-quarter turn, which allows for quick opening and closing. This mechanism is efficient and provides a relatively tight seal when fully closed, making it suitable for applications where rapid flow control is required.

In contrast, the gate valve typically operates by moving a gate up and down to enable or block flow, which often requires multiple turns of the handle. The check valve is used to prevent backflow and does not have a handle for operation, as it automatically detects changes in pressure. The pressure relief valve works by opening at a predetermined pressure to release excess pressure but does not involve a handle that requires a quarter turn to operate. Understanding these distinctions highlights the unique functioning of the butterfly valve in fluid control systems.