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Butterfly valves are a type of quarter-turn valve used for isolating or regulating flow. Here are some characteristics and application ranges of butterfly valves:

Characteristics:

Quarter-turn operation: butterfly valves can be opened or closed quickly with just a quarter-turn of the handle or actuator.

Low pressure drop: due to their streamlined design, butterfly valves have a lower pressure drop compared to other valve types, which makes them a good choice for low-pressure applications.

Lightweight: butterfly valves are typically lighter in weight than other valve types, which makes them easier to install and operate.

Good for throttling: butterfly valves can be used for regulating flow, and have good throttling characteristics.

Bi-directional: butterfly valves can be installed in either direction, making them more versatile in their applications.

Application range:

Water and wastewater treatment plants: butterfly valves are commonly used in these applications due to their low cost and ease of operation.

HVAC systems: butterfly valves are used to regulate flow in heating, ventilation, and air conditioning systems.

Chemical and petrochemical plants: butterfly valves are used for isolating and regulating flow in these plants, as they can handle corrosive fluids.

Food and beverage industry: butterfly valves are used for handling food and beverage products, as they are easy to clean and sanitize.

Oil and gas industry: butterfly valves are used for isolation and regulation of flow in pipelines and storage tanks.

Overall, butterfly valves are a versatile valve type that can be used in a variety of applications due to their ease of operation, low cost, and low pressure drop.