2. Multilayer sealing structure Multilayer sealing structure adopts soft and hard multi stack metal ring to fix the multi stack seal ring on the butterfly plate so that it does not bend and move, and effectively avoids the direct scouring of the media on the laminated seal ring. The sealing surface of the valve seat is welded with hard alloy electrode with excellent wear resistance, thus improving the service life of the butterfly valve. It has the double advantages of metal hard seal and elastic seal, and has excellent sealing performance no matter at high or low temperature. With the 3D eccentric structure design, there is almost no friction between the valve seat and the butterfly plate, and it has the sealing function of tightening as it closes. Plate structure

Use and maintenance
1. The purpose of use and maintenance is to extend the service life of the valve and ensure reliable opening and closing.
2. The valve rod thread often rubs with the valve rod nut, and a little yellow dry oil, molybdenum disulfide or graphite powder should be coated for lubrication.
3. For valves that are not opened and closed frequently, the handwheel should also be turned regularly to add lubricant to the stem threads to prevent seizure.
4. For outdoor valves, the valve rod shall be protected from rain, snow, dust and rust.
5. If the valve is mechanically waiting, add lubricating oil to the gearbox on time.
6. Always keep the valve clean.
7. Frequently check and maintain the integrity of valve parts. If the fixed nut of the hand wheel falls off, it should be complete and can not be used properly, otherwise it will grind the upper four sides of the valve stem, gradually losing the reliability of cooperation, and even can not be started.
8. Do not rely on the valve to support other heavy objects, and do not stand on the valve.
9. The valve rod, especially the thread part, should be wiped frequently, and the lubricant that has been soiled by dust should be replaced with a new one, because the dust contains hard debris, which is easy to wear the thread and valve rod surface, affecting the service life.