Structure and Working Principle of Butterfly Valve

China butterfly valve is also called butterfly valve. As the name suggests, its key components are like butterflies facing the wind and spinning freely. The disc of the butterfly valve is a disc, which rotates around an axis in the valve seat. The size of the rotation angle is the opening and closing degree of the valve.


Ⅰ. The structure of China butterfly valve


Butterfly valve is mainly composed of valve body, living body, valve shaft, bearing, sealing device, operating mechanism and auxiliary parts.


Ⅱ. The working principle of China butterfly valve


Butterfly valve is a kind of valve that opens and closes according to the rotation of the valve stem while driving the disc plate to rotate. In the cylindrical channel of the China butterfly valve body, the disc-shaped disc plate rotates around the axis, mainly by rotating the disc plate 90° to make the flow Control, when the disc reaches 90°, the valve is in a fully open state, and the angle of the disc can be changed to adjust the flow of the medium, which is generally installed in the diameter direction of the pipeline.


Butterfly valve and valve stem have no locking ability. In order to effectively adjust the flow, a worm gear reducer should be installed. The butterfly valve with worm gear reducer not only makes the butterfly valve have self-locking ability, but also changes the operating performance of the butterfly valve and adjusts the medium flow more accurately. .


1. When the butterfly valve is fully opened, it has a small flow resistance. When the opening is between about 15° and 70°, sensitive flow control can be performed, so the application of butterfly valves is very common in the field of large-diameter adjustment. Since the movement of the butterfly valve plate is wiping, most butterfly valves can be used for media with suspended solid particles. Depending on the strength of the seal, it can also be used for powdered and granular media.


2. China butterfly valve is suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipeline is relatively large, about three times that of the gate valve, when selecting the butterfly valve, the influence of the pipeline system by the pressure loss should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium should also be considered when it is closed. . In addition, the operating temperature limitations of the elastomeric seat material at elevated temperatures must also be considered.


3. The structure length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structure principle of butterfly valve is most suitable for making large-diameter valve. When the butterfly valve is required to be used for flow control, the most important thing is to correctly select the specification and type of the butterfly valve so that it can work properly and effectively.


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