JUDU Double Offset Butterfly Valves comply to API609 standard, its structural feature is that the valve stem axis is offset from both the center of the butterfly plate and the center of the valve body channel. This design allows the butterfly plate to quickly separate from the valve seat when the valve is opened, greatly eliminating unnecessary excessive squeezing and scraping between the butterfly plate and the valve seat, thereby reducing the opening resistance, reducing wear, and increasing the life of the valve seat.