Advantages:

①The fluid resistance is small;

②The torque required for opening and closing is small;

③It can be used on the ring network pipeline where the medium flows in two directions, that is to say, the flow direction of the medium is not restricted;

④When fully open, the sealing surface is affected by the working pressure. The erosion of the medium is smaller than that of the globe valve;

⑤The body structure is relatively simple, and the manufacturing process is better; ⑥The structural length is relatively short.

Disadvantages:

①The overall size and opening height are large, and the required installation space is also large;

②During the opening and closing process, the sealing surface is relatively rubbed, and the friction is large, and even it is easy to cause abrasions at high temperatures;

③ Generally, the gate valve has two sealing surfaces, which adds some difficulties to processing, grinding and maintenance;

④The opening and closing time is long.

Advantages:

①Simple structure, small size, light weight, low consumables, especially for large-diameter valves;

②Quick opening and closing, small flow resistance coefficient;

③Can be used for media with suspended solid particles, and can also be used according to the strength of the sealing surface For powdery and granular media. It is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways in metallurgy, light industry, electric power, petrochemical systems, etc.

Disadvantages:

①The flow adjustment range is not large. When the opening reaches 30%, the flow will enter more than 95%.

② Due to the limitation of the structure and sealing material of the butterfly valve, it is not suitable for use in high temperature and high pressure piping systems. The general working temperature is below 300°C and below PN40 (6-40).

③ The sealing performance is poorer than that of ball valves and globe valves, so it is used in places where the sealing requirements are not very high.