Plug valves have a plug as a closure member. Plug can be cylindrical o conical. Ball valves are considered as another group despite they are some kind of plug valve.

Plug valves are used in On/Off services and flow diverting, as they can be multiport configurated.

They can hand fluids with solids in suspension.

Lift plug valve type are designed to rise the plug at start valve operation, in order to separet and protect plug-seat sealing surfaces from abrasion.