Triple Eccentric Butterfly Valve is widely used because of its good sealing and high temperature resistance. In the process of using any product, there are some points needing attention. Even the tri-eccentric butterfly valve with excellent performance is no exception. What problems should we pay attention to in the process of using theTriple Eccentric Butterfly Valve? Let's have a look.
Tri-eccentric metal hard-sealed butterfly valve is a typical tri-eccentric metal-sealed butterfly valve. In addition to the two eccentricities of the stem and the valve plate, the sealing surface of the valve plate and seat is oblique circular platform (this is the third eccentricity of the so-called tri-eccentricity). When the valve closes, the valve plate pushes forward because of eccentricity, and there is no friction between the valve plate and the seat in the closing process. The valve plate is directly pressed on the seat, which ensures the service life of the valve. In addition, the sealing ring of the valve (whether installed on the seat or on the valve plate) has certain elasticity, and a small gap between the convex and the elastic ring in the elastic ring can make the elasticity. Sex ring displaces slightly; when the valve closes, under the action of closing force, the elastomer sealing ring can automatically move to the position where the force is the most uniform; coupled with a small amount of deformation of the elastic ring, the sealing ring at the valve seat is uniformly stressed to achieve a better sealing state.
Tri-eccentric metal sealing butterfly valve with good cutting performance uses torque to cut off the valve, so it has excellent sealing performance at the seat, so it is called zero leakage valve. Solid particles or dirt in the medium have no significant effect on the cut-off performance of the tri-eccentric metal-sealed butterfly valve, because when the valve is close, the medium flow rate is very high, so dirt can not accumulate at the valve seat.

However, there are still some problems in the use of this butterfly valve which need our attention.

First, because the multi-layer soft and hard overlapping seal ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive erosion on its sealing surface, and the soft sealing belt in the metal interlayer is eroded, which directly affects the sealing performance.

2. Restricted by structural conditions, this structure is not suitable for making valves with diameters below DN200. The reason is that the overall structure of the valve plate is too thick and the flow resistance is large.
3. Because of the principle of tri-eccentric structure, the seal between the sealing surface of the valve plate and the seat is to press the valve plate to the seat by the moment of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium countercurrent, with the increase of the medium pressure, the unit positive pressure between the valve plate and the seat is less than the medium pressure, the seal begins to leak.
About the Triple Eccentric Butterfly Valve in the use process need attention, mainly in the above three points, after reading this article, when using theTriple Eccentric Butterfly Valve, we should pay attention to oh.