Advantages butterfly valve as follows:

1.It open and close conveniently and rapidly, fluid resistance, can often manipulate.

2, Simple structure, small size and light weight.

3.It can carry mud in the pipe outlet backlog liquid.

4. Low pressure,it is safe.

5.good control mechanism.

The disadvantage of the butterfly valve is as follows:

1.The range of pressure and temperature is small.

2.Sealing poor.