Advantages
1. It is convenient and quick to open and close, saves labor, has small 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. It can transport mud, and the liquid accumulated at the pipe mouth is the least.
4. Under low pressure, good sealing can be achieved.
5. Good adjustment performance.
6. When fully open, the effective flow area of the valve seat channel is larger, and the fluid resistance is smaller.
7. The opening and closing torque is relatively small, because the butterfly plates on both sides of the rotating shaft are basically equal to the action of the medium, and the direction of the torque is opposite, so the opening and closing is relatively labor-saving.
8. The sealing surface material is generally made of rubber or plastic, so the low-pressure sealing performance is good.
9. Easy to install.
10. The operation is flexible and labor-saving, and manual, electric, pneumatic and hydraulic methods can be selected.
Disadvantage
1. The operating pressure and operating temperature range are small.
2. Poor sealing. 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 types: soft seal type and hard seal type. The soft seal type is generally sealed with a rubber ring, and the hard seal type is usually sealed with a metal ring. 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.
