What Is The Difference Between One-way And Two-way Metal Hard Seal Butterfly Valves?

The simple difference is that one-way sealing butterfly valves can only seal in one direction, while two-way sealing butterfly valves can seal in both directions.
In the selection of hard-sealed butterfly valves, there are generally requirements such as high temperature, low temperature, strong corrosion, strong erosion, and long life. In some special occasions, higher requirements are put forward for the sealing of metal hard-sealed butterfly valves, which must bear pressure in both directions. At present, most metal hard-seal butterfly valves on the domestic market 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.
The two-way metal seal butterfly valve 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. It can be sealed in both directions and is widely used in situations that require two-way sealing, wear resistance, corrosion resistance and long life.