Butterfly Valve

A butterfly valve is a type of flow control device used to regulate or isolate fluid flow in a piping system. It’s named for the way the disc inside the valve rotates like a butterfly’s wings.
Key Components:
1. Valve Body – Fits between two pipe flanges.
2. Disc – The rotating element that opens or closes to control flow.
3. Stem – Connects the disc to the actuator or handle.
4. Seat – Provides a seal between the disc and the valve body.
5. Actuator or Handle – Used to turn the disc (manually or automatically).

How It Works:
• When the disc is parallel to the flow, the valve is open.
• When the disc is perpendicular, the valve is closed.
• It can also be partially opened to throttle flow.

Advantages:
• Compact and lightweight
• Quick to open/close (90° rotation)
• Cost-effective for large pipe diameters
• Low pressure drop when fully open

Disadvantages:
• Not ideal for high-pressure applications
• The disc remains in the flow path, which can cause a slight pressure drop