advantage

1. It is convenient and quick to open and close, labor saving, low fluid resistance, and can be operated frequently.

2. Simple structure, small size, short structure length, small size, light weight, suitable for large diameter valves.

3. Mud can be transported, with the least accumulation of liquid at the pipe mouth.

4. Under low pressure, good sealing can be achieved.

5. Good adjustment performance.

6. When the valve seat channel is fully open, the effective flow area is larger and the fluid resistance is smaller.

7. The opening and closing moment is small. Because the discs on both sides of the rotating shaft are basically the same under the action of the medium, the direction of the torque is opposite, so the opening and closing is less labor-intensive.

8. The sealing surface material is generally rubber, plastic, so the low pressure sealing performance is good.

9. Easy to install.

10. The operation is flexible and labor-saving, manual, electric, pneumatic and hydraulic modes can be selected.

Disadvantage

1. The working pressure and working temperature range are small.

2. Poor airtightness.

Butterfly valves can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure.

According to the sealing form, there are two kinds of soft sealing type and hard sealing type. The soft seal type generally uses a rubber ring seal, and the hard seal type generally uses a metal ring seal.

According to the connection type, it can be divided into flange connection and wafer connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.