One, the preface in order to meet the high temperature, low temperature, strong corrosion, strong erosion, and the use of long life and other industrial requirements, metal sealing butterfly valve to become one of the fastest growing valves varieties in recent years. In some special occasions for metal hard seal butterfly valve seal put forward higher request, must be two-way under pressure. Metal hard seal butterfly valve on the market at home and abroad and more than double eccentric and three-dimensional eccentric sealing principle of these two kinds of sealing structure is under the medium forward flow state, the sealing effect is better; When the media in the current state, because of the medium pressure eccentric torque acting on disc, is not conducive to the valve seal. Moreover, due to the machining gap problem, reverse sealed performance is greatly reduced. Second, the structure of wedge two-way metal sealing butterfly valve is the valve open and close automatically grinding-in compensation theory as a foundation, gate valve, can hold all ball valves, rail type ball valve products such as structure design. Play great positioning pin ensures disc not because butterfly plate gravity drop, also can be installed in the Industrial Valves stem end adjustment block to ensure that the butterfly plate fixed position. During the opening and closing, the valve stem on dovetail groove shrinkage mechanism, screw lift complete vertical linear motion orbit, and butterfly plate must rely on the dovetail groove contraction, screw lift the track to complete the contract from the seat to the center, in the process of the sealing surface with the method of open after release first, guarantee from seal to keep clearance after instantaneous from the seat, no friction, so the valve sealing surface wear, long service life, small torque. And because the wedge block and the role of the dovetail groove of the stem, the valve increases the forced sealing force, increases the sealing pressure ratio, the two-way sealing. Combined sealing ring can be used according to user needs processing and shaping with ptfe as the main materials of soft sealing ring, made of stainless steel and flexible graphite layer pressure multilayer metal o-ring seal or whole stainless steel and etc. , all kinds of forms. Depending on its symmetrical set about butterfly plate, respectively with the body symmetry set around the seat sealing joint, no eccentricity, forming two seal, thus greatly improve the reliability of sealing performance, butterfly plate bidirectional zero leakage. Also can be in the middle of the body to increase water seal device, it can be in the event of an emergency or pipeline to lumen maintenance water filling, have the effect of security protection and a valve in two. Wedge two-way metal sealing butterfly valve USES the double butterfly plate full cone sealing surface structure, can realize on-off valve disc sealing face and body sealing surface constantly in the process of grinding, self correcting, improve the service life. Operation process as the medium pressure is help to open valve, so reduce operating torque. Three, epilogue wedge two-way metal sealing butterfly valve sealing structure is novel, unique double disc have two-way sealing function, therefore more suitable for high temperature and high pressure conditions. processing manufaturability is good, design and manufacture of low cost, is a kind of high technical parameters, high performance industrial conveyor system hard seal butterfly valve.
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