Two-way metal seal butterfly valve

I. Introduction
In order to meet the industrial requirements of high temperature, low temperature, strong corrosion, strong erosion and long life, metal-sealed butterfly valves have become one of the fastest growing valve varieties in recent years. In some special occasions, higher requirements are placed on the sealing of metal hard-seal butterfly valves, which must bear pressure in both directions. At present, metal hard-seal butterfly valves on the domestic and foreign markets mostly adopt double eccentric and three-dimensional eccentric sealing principles. Both sealing structures have better sealing effects when the medium is in the forward flow state; when the medium is in the counterflow state, due to the The pressure acts on the butterfly plate to produce an eccentric moment, which is not conducive to the sealing of the valve. Furthermore, due to the gap problem in machining, the reverse sealing performance is greatly reduced.

2. Structure
The wedge-type two-way metal seal butterfly valve (shown in Figure 1) is designed based on the automatic grinding seal compensation theory when opening and closing the valve, combined with the structural features of gate valves, expandable ball valves, orbital ball valves and other products.

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