Marine Double Eccentric Butterfly Valve
Double eccentric Butterfly Valve is further improved on the basis of Single Eccentric Butterfly Valve. Its structural characteristics are that the axis of the valve stem deviates from both the center of the butterfly plate and the center of the body. The effect of double eccentricity makes the valve to be opened after the butterfly plate can be quickly detached from the valve seat, greatly eliminating the butterfly plate and the seat of the unnecessary excessive pressure, scraping phenomenon, reduce the opening distance, reduce wear and tear, and improve the life of the valve seat. The substantial reduction of scraping also makes it possible to use metal seats for double eccentric butterfly valves, which improves the application of butterfly valves in the field of high temperature.
Overview
Design：
Double Eccentric Butterfly Valves can be designed in the form of rubber, PTFE and metal hard seals. For example, C-type, O-type or U-type metal sealing ring and other forms. If you want to make a taper to taper metal hard seal without interfering, sometimes the secondary eccentricity to do more, resulting in the need for a large eccentric torque, so that the open torque is too large.
Working Principle:
When the Double Eccentric Butterfly Valve is in the open state, the valve stem will drive the butterfly plate to rotate to 90 degrees so that the orifice of the butterfly plate is aligned with the pipeline, forming a smooth flow path that allows fluid to pass through.
When the Double Eccentric Butterfly Valve is in the closed state, the valve stem will continue to rotate, rotating the butterfly plate to 0 degrees, so that the orifice of the butterfly plate is perpendicular to the pipeline, thus completely cutting off the passage of fluid.
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