gate:

Gate valve refers to a valve whose closing part (gate) moves along the vertical direction of the channel axis. It is mainly used for cutting off the medium in the pipeline, that is, fully open or fully closed. Generally, the gate valve cannot be used as an adjustment flow. It can be suitable for low temperature pressure or high temperature and high pressure, and can be based on different materials of the valve. However, gate valves are generally not used in pipelines that transport mud and other media.

Advantages: ① small fluid resistance; ② small torque required for opening and closing; ③ can be used in the ring network pipeline where the medium flows in both directions, that is, the flow direction of the medium is not restricted; ④ When fully opened, the sealing surface is affected by the working medium The erosion is smaller than that of the stop valve; ⑤The body structure is relatively simple, and the manufacturing process is better; ⑥The structure length is relatively short.

Disadvantages: ①The external dimensions and opening height are large, and the space required for installation is also large; ②In the process of opening and closing, the sealing surface is relatively rubbed and the wear is large, and it is easy to cause scratches even 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.

Butterfly valve:

The butterfly valve is a valve that uses a disc-type opening and closing member to reciprocate about 90° to open, close and adjust the fluid channel.

Advantages: ①Simple structure, small size, light weight, low consumables, suitable for large-diameter valves; ②Quick opening and closing, low flow resistance; ③It can be used for media with suspended solid particles, and can also be used for powder according to the strength of the sealing surface And granular media. It can be applied to the 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, and petrochemical systems.

Disadvantages: ①The flow rate adjustment range is not large. When the opening reaches 30%, the flow rate will enter more than 95%. ②Due to the limitation of the structure of the butterfly valve and the sealing material, it is not suitable to be used in the high temperature and high pressure piping system. The general working temperature is below 300℃ and below PN40. ③The sealing performance is poorer than that of ball valves and stop valves, so it is used in places where the sealing requirements are not very high.