The plug valve is a closing or plunger-shaped rotary valve that opens or closes by rotating the passage port on the valve plug 90 degrees or the same as the passage port on the valve body. The plug of the plug valve may be cylindrical or conical in shape. In a cylindrical valve plug, the passage is generally rectangular; in a tapered valve plug, the passage is trapezoidal. These shapes make the structure of the plug valve light, but at the same time cause some loss. Plug valves are best suited for use as a shut-off and closing medium as well as for shunting, but can sometimes be used for throttling depending on the nature of the application and the erosion resistance of the sealing surface.

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