Application of tungsten carbide seat

       

Tungsten carbide seats also have a long service life in harsh conditions. In polysilicon, coal chemical industry, power plant ash removal, mud and boiler slag discharge and other material transportation pipelines, the valve sealing part is not only subject to the sliding friction and wear of the sealing parts, but also withstands high-speed impact of high-temperature and high-hardness gas-solid dual-phase mixture, and high pressure Fluid-induced flashing and cavitation, which in turn causes damage, exacerbates valve failure. Therefore, under severe working conditions such as powder conveying, wear resistance has become an important performance evaluation index for tungsten carbide valve seats.

The tungsten carbide valve seat is made of a mixture of tungsten and carbon heated at high temperature. Most of the tungsten carbide has high hardness, good wear resistance, is not easy to decompose at high temperature, and has good oxidation resistance. The investigation of on-site use shows that the wear resistance of tungsten carbide in the case of abrasive wear, erosion wear and abrasion is 100 times higher than that of tool steel, stainless steel, iron and brass, and its rigidity is 2 to 3 times higher than that of steel. , 4 to 6 times higher than that of cast iron and brass, and the impact resistance is similar to that of hardened tool steel.



   In coal gasification and polysilicon, high temperature, high pressure, strong corrosiveness, and slurry and powder containing solid particles, tungsten carbide materials are now used, and tungsten carbide valve seats are widely used, such as hard sealing ball valves, Venturi Disc and valve seat for black water control valve, pulverized coal control valve, disc valve and slide valve.