Introduction to Plug Valves

A plug valve is a quarter-turn rotary valve that uses a cylindrical or conically tapered plug to control fluid flow. The plug has one or more hollow passageways that allow flow through the valve when aligned with the pipe.

How It Works

• The plug rotates inside the valve body to open or close the flow path.

• When the passage in the plug aligns with the pipe, fluid flows through.

• A 90° turn of the plug blocks the flow by turning the solid side of the plug into the flow path.

• Operated manually or with actuators for automated systems.

Key Features

• Quick Operation: Quarter-turn design allows fast opening and closing.

• Simple Construction: Fewer parts make it easy to maintain.

• Tight Sealing: Especially in lubricated or sleeved designs.

• Versatile Flow Paths: Available in 2-way, 3-way, and multi-port configurations.

Limitations

• Higher Torque: May require more force to operate, especially in larger sizes.

• Wear Over Time: Friction between plug and body can lead to wear.

• Not Ideal for Throttling: Better suited for on/off applications.