Full definition
Butterfly valves are quarter-turn valves that utilize a disc mounted on a central shaft to control the flow of fluids in a piping system. These valves are recognized for their compact design and lightweight structure, making them suitable for space-constrained applications. They can achieve high flow coefficients (Cv) and are versatile for both on/off service and moderate throttling applications. The construction typically allows for sizes ranging from 2" to 120" (DN50 to DN3000), accommodating various industrial needs. Depending on the design, butterfly valves can handle pressure ratings up to 25 bar for concentric types and up to 100 bar for triple-eccentric models, making them suitable for high-pressure applications.
The three primary types of butterfly valves include concentric, double-eccentric, and triple-eccentric configurations. Concentric butterfly valves are often equipped with elastomeric seating, functioning effectively at temperatures up to 200°C, making them ideal for general applications. The double-eccentric and triple-eccentric designs, which often feature metal-to-metal seating, are engineered for higher performance and can withstand elevated temperatures and pressures, making them suitable for critical applications in industries such as oil and gas, chemical processing, and power generation.
Standards such as API 609 and EN 593 govern the design, manufacturing, and testing of butterfly valves, ensuring reliability and safety in various operational environments. In industrial settings, these valves are frequently used in water treatment plants, HVAC systems, and chemical processing facilities, where reliable fluid control is essential. Proper selection of butterfly valves should consider factors like flow characteristics, pressure ratings, and compatibility with the media being transported to ensure optimal performance and longevity.