The Basic Knowledge About Butterfly Valves
What is the purpose of the butterfly valve?
A butterfly valve regulates flow by starting, slowing, or stopping media. The disk opens and closes with a low-torque rotation of 90 degrees and works for any compatible application. Because they cost less and are lighter weight, the butterfly valve is often preferred over other types of valves.
How does a butterfly valve work?
The opening and closing member of a sanitary butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the sanitary valve body to achieve the purpose of opening, closing, and regulating. Full opening to the full closure of a butterfly valve is usually less than 900. The butterfly valve and butterfly rod themselves don’t have self-locking capabilities. In order to position the butterfly plate, a worm-wheel reducer needs to be installed on the valve rod. Using a worm-wheel reducer not only makes the butterfly plate have self-locking capabilities, which make the butterfly plate stop at many positions, but also improves the operating performance of valves.
The advantages of butterfly valves:
- Convenient, fast, effortless opening and closing; small fluid resistance; frequent operation.
- Simple structure, small size, lightweight.
- Being able to transport mud; smallest accumulation of liquid at the opening of the pipeline.
- Good sealing under low pressure.
- Good regulating performance.
The disadvantages of butterfly valves:
1. Small range of working pressure and temperature.
2. Poor sealing.
The installation and maintenance of the butterfly valves:
1. During installation, the valve flap must stay at the closed position.
2. The opening position should be decided according to the rotating angle of the butterfly plate.
3. For those butterfly valves with bypass valves, bypass valves need to be opened before opening the butterfly valves.
4. Installation should be performed according to the manufacturer’s installation manuals. There needs to be a solid foundation for heavy butterfly valves.