Wear-resistant semi-ball valves are designed for the coal slurry medium in Texaco coal chemical industry and CTL industry. As special structure ,The  scaling of coal particle can be avoid effectively. They are widely used in chilling water pump ,high or low pressure grey water pump, coal slurry pump ,the lnlet and out let of filter equipment， coal slurry conveying pipelines,dry dedusting system,spray coal system and coal ash treatment system etc.