Manual Butterfly valve

A manual butterfly valve is a simple device for regulating fluid flow in pipes. Imagine a metal disc inside the pipe that pivots on a rod. When turned a quarter turn (90 degrees), the disc aligns with the pipe, allowing full flow. Turn it perpendicular to the flow, and it blocks the pipe. These valves are popular for their compact size, ease of use (often with a hand lever or gear operator), and good flow control. They are commonly used in water systems, but not ideal for completely stopping leaks due to the disc always being slightly in the flow path.