[Three-eccentric Center Flange Metal Seal Butterfly Valve]——
Eccentric metal seal structure, the seal form is metal-to-metal seal, metal seal ring to metal seal can be replaced, stainless steel plate and graphite composite plate seal ring to metal seal. In addition to electric drive, the hard seal butterfly valve is also driven by manual, worm gear drive, pneumatic, etc. The butterfly plate of the hard seal butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the valve body of the butterfly valve, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it is rotated to 90°, the valve is fully opened. At present, the flange hard seal butterfly valve, as a component used to realize the on-off and flow control of the pipeline system, has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. The valve body and valve seat are connected parts, and the sealing surface layer of the valve seat is welded with temperature-resistant and corrosion-resistant alloy materials. The multi-layer soft stack type sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has high temperature resistance, easy operation, no friction when opening and closing. When closing, the torque is compensated with the increase of the torque of the transmission mechanism, and the butterfly valve is improved. The sealing performance and the advantages of extended service life.
Three-eccentric multi-level flange hard seal butterfly valve combines long-life, non-leakage and energy-saving butterfly valve developed by advanced technology at home and abroad. The product adopts the three-eccentric principle design and has a multi-layer structure with reliable sealing performance. It is a general purpose butterfly valve. The extension and development of high pressure and medium and high temperature fields.
Three-eccentric multi-level flange hard seal butterfly valve complies with national standards JB/T8527-97 (metal hard seal butterfly valve) and GB/T13927-92 (general valve pressure test) standards and other relevant standards of the valve, applicable to medium temperature ≤650 ℃ metallurgical, power, petrochemical, air, and water supply and drainage media pipelines to adjust the flow rate and cut off the fluid.
The three eccentric flange hard seal butterfly valve body and pipeline are connected with double flange connection, wafer connection and lug wafer connection.
1. The butterfly plate sealing ring is a soft and hard laminated metal sheet, which has the dual advantages of metal hard seal and elastic seal. It has excellent sealing performance no matter under the condition of low temperature and high temperature;
2. The three-dimensional eccentric structure is adopted, and the valve seat and the butterfly plate have almost no friction, and the sealing function is tighter and tighter;
3. The sealing surface of the valve body adopts surfacing welding stainless steel and cobalt-based cemented carbide. The sealing surface is wear-resistant and has a long service life;
4. Unique structure, flexible operation, labor saving, convenient, not affected by the high and low pressure of the ring, and reliable sealing performance.