At present, there is a kind of butterfly valve which is called triple eccentric multiplex ring metal-seat butterfly valve. It is a new valve which has greatly made good use of the advanced technologies. The valve body and the valve seat is one piece. And it is the hard sealing whose face is around with the materials with resistance to high temperature and strong corrosion. The specially defined structure aims to make the operation be convenient and smooth, together with the better tightness. However, as a new invention, there are still a lot of points which need improvement.

It appears that the multi-layer stacked rings are fixed to the valve plate. When the valve plate is within the normally open state, the medium would directly flow to the sealing face. Within the long period of erosion, the soft ring would be damaged more or less, leading seriously to the failure of the tightness. Then, it is not admitted to produce the diameter of DN200, resulting from the thick overall structure. What else, as the sealing is on the transmission of torque pressure to pass the power from the valve plate to the valve seat, the countercurrent flow of the medium would increase the pressure, leading the damage to the sealing.

Since there are still plenty of problems needed to be solved, the competent advantages and outstanding performance should not be ignored. Generally speaking, the new type can be use as a gate vale, a stop valve or ball valve. No matter what, after a period, it would be bring in more and more benefits.

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