Stellite is a wear-resistant, corrosion-resistant, high-temperature oxidation-resistant hard alloy, namely cobalt-chromium-tungsten (molybdenum) alloy or cobalt-based alloy, invented by American Elwood Haynes in 1907. Its main component is cobalt, and also contains a certain amount of nickel, chromium, tungsten, and a small amount of molybdenum, niobium, tantalum, titanium, lanthanum and other elements. According to the composition of the alloy, it can be made into welding wire and powder, and can also be made into castings and forgings and powder metallurgy parts, which are widely used in surfacing, thermal spraying, spray welding and other processes.

Bushings are used for mechanical parts to achieve functions such as sealing and wear resistance. The valve cover bushing is usually made of corrosion-resistant materials such as PTFE or graphite, and can also be made of stellite alloy, which has the effect of sealing, anti-corrosion and strength enhancement.

The anti-corrosion pump oil well with valve cover liner enhances the corrosion resistance and impact resistance of the pump and valve cover, and is suitable for oil well production with high salinity, easy corrosion and valve cover fracture.

For conventional oil well pumps, sand particles easily enter the sealing gap during the oil pumping process, causing wear of the pump barrel and plunger. Due to the sand scraping ring, the diameter of the sand particles in the well fluid passing through the sand filter screen is smaller than the size of the sealing gap, which will not cause wear on the pump barrel and plunger, and will not cause sand stuck; it is different from the sealing ring of the soft seal pump: the upper and lower ends of the The pressure is balanced, the positive pressure of the pump barrel is just its own elastic force. Hence low wear and long service life.