In order to solve the problem of the extrusion of the butterfly plate and the valve seat of the concentric butterfly valve, a single eccentric butterfly valve was produced. Disperse and reduce the excessive squeezing between the upper and lower ends of the butterfly plate and the valve seat.
Double eccentric butterfly valve
On the basis of the single eccentric butterfly valve, the double eccentric butterfly valve is the most widely used double eccentric butterfly valve. Its structural feature is that the axis of the valve stem deviates from the center of the butterfly plate and the center of the body. The effect of double eccentricity enables the butterfly plate to be released from the valve seat immediately after the valve is opened, which greatly eliminates unnecessary excessive extrusion and scratching between the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves The life of the valve seat is improved.
The valve usually needs a pin to fix the plate and shaft, but for some severe working conditions and substitutes to save costs, we will also adopt a large number of pin free designs. As shown in the figure, there is one kind of pin free, hexagonal pin free, which is also the most common one at present. Of course, there are other forms of pin free, such as square pin free, flat square, etc.
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