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Butterfly valves belong to the quarter-turn rotational motion valves family and are used primarily to stop, regulate, or start the flow. The term “butterfly” in a butterfly valve is actually a disk that is connected to a rod. When this rod rotates the disk by 90° the butterfly valve opens or closes. Butterfly valves are popular in the industry because of their lightweight, fast operation, and low costs. These valves use handles, gears, or automatic actuators for operation as per the requirement.

Smaller-size butterfly valves usually have manual operation whereas larger devices are normally motorized. With high flow capacities, butterfly valves enable the use of smaller units that reduces weight, cost, and space requirement significantly. With only two wetted parts and a range of valve linings, butterfly valves isolate the body from the flowing media which eliminates the need for expensive exotic materials.

Butterfly Valve Uses

The use of Butterfly valves is broad and wide. Some typical applications of butterfly valves are in the water supply, wastewater treatment, slurry services, fire protection, air and gas supply, vacuum services, lubrication system, chemical and oil industries, fuel handling systems, power generation, compressed air and gas services, steam services, food processing, pharmaceutical, marine systems, and sanitary valve application. Basically, Butterfly Valves are suitable for use in

• Constant Load Applications
• Space-Restrictive Applications
• Throttling Valves
• Throttling Valves

Types of Butterfly Valves

Depending on disc closure design, connection design, and actuation method, Butterfly valves can be categorized into several types.

• Based on the Disc Closure Design: Concentric Butterfly Valve; Eccentric Butterfly Valve; Double Offset; Triple Offset
• Based on the Piping Connection: Lug type; Wafer Type; Flanged Butterfly Valve; Butt-welded Butterfly Valves for high-pressure applications
• Based on the Operation method: Manual Actuation; Lever Operated; Gear Operated; Electric; Pneumatic; Hydraulic
• Based on Seat Material: Soft Seated; Metal Seated

Functions of a Butterfly Valve

The main functions of a butterfly valve are:

• Flow regulation/Isolation: Flow can be easily controlled or regulated simply by turning the valve wheel. Using a flow controller the process can be automated.
• Prevention of Backflow: Butterfly valves can be used for backflow prevention in some situations.