At present, the butterfly valve is widely used as a piping system for the realization and flow control of components suitable for petroleum, chemical, metallurgy, electric power, and many other fields. A more advanced three eccentric butterfly valve is a metal seal valve, the valve seat seal surface surfacing Siamese body structure, heat-resistant, corrosion-resistant alloy materials. Multi-layer soft-folded ring fixed to the valve plate, butterfly valve compared to the traditional, high temperature, easy to operate, open and close frictionless torque transmission mechanism to improve the seal butterfly valve sealing performance and prolong the service life. First, the existing problems, triple eccentric butterfly valve seal in the use of the process there are still the following problems: 1, because the soft folding multi-layer fixed in the valve seal, when the disc, the national media, the positive seal by the soft seal of the erosion of the seal After a direct impact on the sealing performance of the valve. 2, the structure of the constraints to do DN200 diameter valve, the reason is lower than the overall structure of the disk is too thick, flow resistance. 3, because of the principle, the seal between the three eccentric valve disc and the valve seat sealing structure adopts the gear transmission, at the moment valve disc. The official media stream, better squeeze pressure tight seal. When the upstream pressure in a port increases, the pressure between the valve disc and the seat is small and the unit's MV seal begins to leak. Second, high-performance three eccentric butterfly valve seal two-way advantage. High-performance three-eccentric butterfly valve two-way hard seal structure is unique and superior performance. 1), high-performance three-eccentric butterfly valve sealing two-way seat without soft sealing T-shaped multi-layer stainless steel. 2), disc and valve seat seal structure for the tapered cone surfacing temperature resistance in the valve, oblique corrosion resistant alloy material, 3), the adjustment ring is fixed in the
Spring and autumn season board structural adjustment bolts together. This structure effectively compensates for the pressure of the body and stem of the medium between the collar and the tolerance zone and solves the sealing problem of the bi-directional AC drive of the valve of the elastically deformable medium. Third, the use of soft T on both sides of the multi-layer stainless steel seal when the metal with a hard seal and soft seal, both in the case of low temperature and high temperature, with zero leakage seal performance. Fourth, to prove the flow direction of flow in the pool and the rotation direction of the disc), the pressure sealing device torque and medium pressure valve. Positive pressure increases the disc and seat sealing surface bevel seal the better, too crowded. Back to the valve disc and seat seal transmission, the valve pressure torque valve seat. With increasing pressure, the pressure between valve disc and valve seat is small, and the deformed medium pressure valve disc and valve seat are stored in medium pressure specification of the unit to compensate for the tight seal pressure and will be automatically compensated. Fifth, high-density 256 eccentric bidirectional hard-sealed butterfly valve installed in the flap indirect multi-layer seal is hard, but directly installed in the body, the middle of the seat is ideal to add adjustment plate bidirectional hard seal. Six, high-performance triple eccentric butterfly valve, it will replace double sealed gate valve, globe valve and ball valve.
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