Butterfly valve and gate valve advantages and disadvantages analysis introduction

Advantages: 1 simple structure, small size, light weight, consumables, especially for large diameter valves; 2 quick opening and closing, small flow resistance coefficient; 3 can be used for medium with suspended solid particles, depending on the strength of the sealing surface In powdered and granular media. It can be applied to the two-way opening and closing and adjustment of ventilation and dust removal pipelines. It is widely used in gas pipelines and waterways of metallurgy, light industry, electric power and petrochemical systems.
Disadvantages: 1 The flow adjustment range is not large. When the opening is up to 30%, the flow rate will be more than 95%. 2 Due to the structure of the butterfly valve and the limitation of the sealing material, it is not suitable for use in high temperature and high pressure piping systems. The general operating temperature is below 300 ° C, PN40 (6 ~ 40) or less. 3 Sealing performance is relatively poor compared to ball valves and globe valves, so it is not used for sealing requirements. KEYSTONE cylinder
The gate valve refers to a valve in which the closing member (gate) moves in the vertical direction of the channel axis, and is mainly used as a cutting medium in the pipeline, that is, fully open or fully closed.
In general, gate valves are not available for regulated flow. It can be applied to low temperature pressure or high temperature and high pressure, and can be made according to different materials of the valve. However, gate valves are generally not used in pipelines for conveying media such as mud.
Advantages: 1The fluid resistance is small; 2The torque required for opening and closing is small; 3 can be used on the ring network flowing in the two directions, that is, the flow direction of the medium is not limited; 4 When the valve is fully open, the sealing surface is working. The erosion of the medium is smaller than that of the shut-off valve; the 5-shaped body structure is relatively simple, and the manufacturing process is good; 6 the structure length is relatively short.
Disadvantages: 1 The external dimensions and opening height are large, and the required installation space is also large; 2 During the opening and closing process, the sealing surface is relatively frictional, the friction loss is large, and even the high temperature is likely to cause scratches; Generally, the gate valve has two sealing faces, which adds some difficulties to processing, grinding and maintenance; 4 long opening and closing time.