A Concentric Butterfly Valve is a type of quarter-turn valve that features a disc positioned in the center of the pipe, with the stem running through the disc. It’s known for its simple design and the ability to control the flow of liquids or gases by rotating the disc within the valve body. The term “concentric” refers to the alignment of the valve’s disc and seat, where both are centered.
Working: The working principle of a concentric butterfly valve is straightforward. When the handle or actuator turns the valve’s stem, the disc rotates to either block, partially open, or fully allow the flow of fluid. In the fully open position, the disc is aligned parallel to the flow direction, allowing minimal obstruction. In the closed position, the disc seals against a rubber or elastomeric seat, stopping the flow completely.
Function: Concentric butterfly valves are commonly used to regulate, start, or stop the flow of liquids or gases in a pipeline. Due to their compact design and efficient operation, they are frequently found in industries such as water distribution, HVAC, chemical processing, and wastewater treatment. These valves are especially effective in low to medium-pressure applications.
Features:
1)Simple Construction: With fewer parts than other valve types, the concentric butterfly valve offers cost-effective and lightweight solutions for flow control.
2)Quick Operation: The quarter-turn operation allows fast opening and closing, which is beneficial in emergency shutoff scenarios.
3)Elastomeric Seat: The seat material is typically made from rubber or elastomer, ensuring a tight seal when the valve is in the closed position.
4)Low Pressure Drop: In the open position, the disc creates minimal resistance to the flow, resulting in a lower pressure drop across the valve.
5)Compact Design: Butterfly valves are more space-saving compared to other types like gate or globe valves, making them ideal for tight spaces.
6)Corrosion Resistance: Depending on the materials used for the valve body and disc, concentric butterfly valves can offer excellent corrosion resistance, enhancing durability.
Concentric butterfly valves are efficient and reliable, providing effective flow control with minimal maintenance requirements, making them a popular choice for many industrial and commercial applications.
