Plug valve is Quarter-turn rotary motion Valve that uses a tapered or cylindrical plug to stop or start the flow. The disk is in plug shape, which has a passage to pass the flow. In open position, this bored passage is in line with the flow. When the plug is turned 90° from the open position, the solid part of the plug blocks the flow.Plug valve is used in place of gate valve where a quick operation is required. It can be used in high-pressure temperature services.
Typical plug valve is consisting of body, bonnet, stem and plug. The seat is an integral part of the body in case of lubricated plug valve. For non-lubricated plug valve, a non-metallic seat is used to improve leak tightness of the valve.