A butterfly valve is a kind of completely closed valve with a simple design. When the disc is closed, it blocks the valve bore; when it is turned open, it allows flow. A quarter-turn of the valve moves it from fully open to fully closed, or vice versa, and thus the butterfly valve allows for quick opening and closing.
Butterfly valves have numerous applications. Butterfly valves are used in applications that require large volume capacities. It is useful for flow control, regulation, and service on/off switching. Recent technological advances have enabled this type of valve to throttle more precisely and to perform well in high-temperature and high-pressure applications. Despite the fact that butterfly valves can be used as isolation valves, the piping system must be carefully designed to eliminate system losses. Butterfly valves with high performance are inexpensive, easy to install, and require little maintenance. They are employed in a wide range of industries.
Some of the industries that use butterfly valves for industrial processes are listed below.
- Vacuum services
- Aerospace sectors
- Refrigeration and Air Conditioning systems
- Irrigation and agricultural needs
- Corrosive processing
- District heating, mining, and shipyards
- Petroleum Industries
- Wastewater treatment
- Slurry application
- High-pressure and high-temperature water and steam services
- Compressed air applications
- Sanitary valve applications
- Sprinkler and fire protection systems
- Gas application
Butterfly valves used for modulating services can be classified into two types, which are as follows: –
When the flow rate has a linear relationship with the distance the disc travels, it means that the flow rate will be at the same X percent of maximum flow rate at X percent of disc opening. As an example, if the disc is opened 1/3 of a turn (30 degrees), the flow rate will be 33.3 percent of the maximum.
When a butterfly valve has an equal percentage characteristic, it means that equal increments of valve travel result in equal percentage changes in flow rate. For example, if moving from 30 to 40 degrees opened increased the flow rate from 100 to 170 m3/h (by 70%), then moving from 40 to 50 degrees will increase the flow rate from 170 to 289 m3/h (by 70 percent). As a consequence, the disc travel and flow rate have a logarithmic relationship. Because of advancements in the butterfly valve design, the equal percentage characteristic is now possible for opening angles ranging from 20 to 90 degrees.
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