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.