Manual Butterfly Valve :
A manual butterfly valve is a type of quarter-turn valve used to regulate or isolate the flow of a fluid (liquid or gas) through a pipe. It gets its name from the design of its disc, which resembles the wings of a butterfly. The valve operates by turning a handle or lever, which in turn rotates the disc inside the valve body.
Here are the key components and features of a manual butterfly valve:
Body: The main structure that houses the internal components. It typically has a circular shape.
Ball Design: The ball inside the valve has a bore or port through which the fluid flows. When the ball is rotated, the bore aligns with the flow path, allowing the fluid to pass, or it can be turned to block the flow.
Disc: The disc is a flat, circular plate that is mounted in the center of the valve. It rotates on its axis to control the flow of the fluid. The disc is often positioned perpendicular to the flow when closed and parallel to the flow when fully open.
Shaft: The shaft is the rod or spindle that connects the disc to the external actuation mechanism, such as a handle or lever.
Seat: The seat is a sealing surface where the disc makes contact to shut off the flow. It ensures a tight seal when the valve is closed, preventing leakage.
Actuation Mechanism: In a manual butterfly valve, the actuation mechanism is typically a handle or lever attached to the shaft. Turning the handle or lever rotates the disc, allowing the operator to control the flow.
Handle or Lever: The external control device used to operate the valve. It is turned by the operator to open or close the valve.
Position Indicator: Some manual butterfly valves come with a position indicator to show whether the valve is in the open or closed position. This can be helpful for operators to quickly assess the status of the valve.
Manual butterfly valves are commonly used in various industries due to their simplicity, cost-effectiveness, and ease of operation. They are often preferred for applications where fast and frequent operation is required, and precise flow control is not critical.
