Brief Introduction of Butterfly Valves

Different Types of Butterfly Valves

A butterfly valve is a quarter-turn valve that uses a disk-shaped element (butterfly) mounted on a shaft to control the fluid's flow rate. The disk rotates 90 degrees to either fully open or close the passage when the handle or actuator is turned. The butterfly valve has a simple construction, comprising a circular body, a disk, and a stem. The disk is installed centrally within the body, and the stem connects it to a handle or an actuator. The valve operates by rotating the disk, so its edges move into or out of contact with the body seat, allowing or restricting the fluid's flow rate. Butterfly valves are available in various types, including concentric, double-offset, triple-offset etc.

1.Triple Eccentric Butterfly Valve

An eccentric butterfly valve has a disc that is offset from the center of the valve body. As the valve opens and closes, the disc moves away from or towards the seat, creating a variable flow area. This design reduces the torque required to operate the valve, making it suitable for large-scale applications. Eccentric butterfly valves are commonly used in water treatment plants, power plants, and chemical processing facilities.

2. Double Eccentric Butterfly Valve

A double eccentric butterfly valve has two offsets: one at the disc and another at the stem. This design allows the disc to completely disengage from the seat, reducing wear and tear on the valve components. Double eccentric butterfly valves are popular in oil and gas production, refining, and distribution.

3. Concentric Butterfly Valve

Concentric butterfly valves have a disc that is attached to the stem at the center of the valve body. This design provides a uniform sealing force around the entire circumference of the valve, reducing the chances of leakage. Concentric butterfly valves are frequently used in food and beverage, pharmaceuticals, and water treatment industries.

4. Cryogenic Butterfly Valve

Cryogenic butterfly valves are designed to withstand extremely low temperatures. They use special materials and seals that can withstand the thermal shock caused by rapid changes in temperature. Cryogenic butterfly valves are used in liquefied natural gas (LNG) plants, petrochemical plants, and other low-temperature applications.

5. High-Performance Butterfly Valve

High-performance butterfly valves are designed for high-pressure and high-temperature applications. They have a stronger construction and can handle more extreme operating conditions than regular butterfly valves. High-performance butterfly valves are commonly used in chemical processing, power generation, and water treatment facilities.