A butterfly valve uses a rotating disc to control the opening and closing of a pipeline. The angle of rotation reflects the degree of valve opening.
Depending on the actuation method, butterfly valves are divided into three types: manual, pneumatic, and electric. The most common is manual, where rotating the handle drives the valve stem via gear transmission, thus opening and closing the valve.
Features: Butterfly valves have advantages such as simple structure, rapid opening and closing, low fluid resistance, and convenient maintenance. However, they cannot be used in high-temperature and high-pressure applications, and are suitable for large-diameter water, steam, air, and oil pipelines with PN less than 1.6 MPa and t less than 120 degrees Celsius.
Usage Precautions:
1. The valve core can only rotate 90 degrees. The valve body usually indicates the CLOSE and OPEN arrow directions. Turning the handwheel clockwise closes the valve, and counterclockwise opens it.
2. If there is resistance when opening or closing, a special F-wrench can be used to open the valve, but do not force it open or close, otherwise the valve stem gears will be damaged.
3. Do not remove the handwheel and use an adjustable wrench to turn the valve stem. (The same applies to the valves below.)
4. Open and close the valve gradually, observing for any abnormalities to prevent leakage.
