Definition difference:
Butterfly valve is also called flap valve. Its opening and closing part is a disc-shaped butterfly plate. The butterfly plate rotates around the valve shaft to realize the opening and closing of the valve. The butterfly valve can be used as a cut-off valve on the pipeline or as a Adjust flow usage. The rotation angle of the butterfly plate is between 0-90°. When the rotation angle is 90°, the butterfly valve is in a fully open state. At this time, only the thickness of the butterfly plate is the only resistance of the fluid, and the fluid resistance is small.
Gate valve is also called gate valve, which is also the most common opening and closing valve. Its opening and closing parts are called gates. The gate moves up and down with the valve stem to realize the opening and closing of the valve. The media direction is vertical. The gate valve can only be fully opened or fully closed, and it can only be used to cut off the circulation of the medium on the pipeline. When the gate valve is fully open, the fluid resistance of the fluid in the valve body is smaller than that of the butterfly valve.
Differences in applicable conditions:
Butterfly valve can not only cut off, but also have the function of regulating flow. The scope of application is wider than that of gate valves. The butterfly valve opens and closes quickly, and can be opened and closed frequently, so in the working environment where the opening and closing speed is required or the opening and closing are more frequent, the butterfly valve is the first choice. Under the conditions of the same caliber, the butterfly valve should be smaller in shape and lighter in weight. Under the conditions of limited installation space, choosing a wafer butterfly valve will save more space. Butterfly valves of the same diameter are also cheaper than gate valves.
In addition, butterfly valves are more suitable for large diameters, and butterfly valves are also suitable for conveying medium pipelines containing small particles and other impurities. However, the butterfly valve also has disadvantages. Its pressure and working temperature range are not as good as that of the gate valve, and the sealing performance is not as good as that of the gate valve. The price of butterfly valves of the same diameter is much lower than that of gate valves.
Because of its own structure, gate valve has smaller flow resistance than butterfly valve and better sealing performance than butterfly valve. The switch of the gate valve is laborious and the opening and closing speed is slow, which is not suitable for use in occasions requiring frequent operation or emergency cut-off, and the gate valve can only be fully opened and fully closed, and cannot be used to adjust the flow. Therefore, gate valves are mostly used to cut off pipelines that have strict requirements on sealing performance and do not require frequent opening and closing. It is not suitable for adjusting the parameters of the pipeline medium.
The gate valve has strong adaptability and can be used in high temperature, low temperature, high pressure, low pressure and other working conditions. In steam pipelines and large-diameter water supply pipelines, gate valves are suitable because of the need for higher sealing performance and less fluid resistance.
