Plug valves have cylindrical or tapered plugs that rotate within the valve body to control fluid flow through the system. They are commonly used in the piping industry for various applications due to their simple design, reliable operation, and ability to provide effective shut-off capabilities.
Design
Plug valves consist of a cylindrical or tapered plug rotated within the valve body. The plug typically has a hole or port that aligns with the inlet and outlet ports of the valve body to allow fluid to flow when the valve is open. Rotating the plug 90 degrees closes off the flow by aligning the plug with the valve body’s solid portion, effectively blocking fluid passage.
Flow Control
Plug valves provide effective flow control by allowing for full or partial opening of the passage through the valve. The degree of flow regulation is determined by the degree of rotation of the plug within the valve body. This design allows for quick and easy operation to start, stop, or throttle fluid flow.
Shut-Off Capabilities
One of the critical features of plug valves is their ability to provide reliable shut-off capabilities. When fully closed, the plug forms a tight seal against the valve body, preventing the passage of fluid through the system. This makes plug valves suitable for applications where positive shut-off is necessary, such as in isolation and emergency shut-off valves.
Versatility
Plug valves are versatile and can be used in various industries. They are commonly employed in applications involving the handling of liquids, gases, and slurries, including water distribution, wastewater treatment, oil and gas production, chemical processing, and refining.
Durability
Plug valves are known for their durability and resistance to wear and corrosion, mainly when constructed from materials such as stainless steel, brass, or corrosion-resistant alloys. This makes them suitable in demanding operating conditions where other valves may degrade over time.