长输管线系列球阀不仅选材广泛且内件材料均采用表面镀镍或是316材质、密封圈采用特制的聚合物材料。
Pipeline series ball valve is not only wide selection of parts and materials are used in nickel-plated or 316, seal with a special polymer material.
由高密度聚合物压制而成，通过特制的工艺程序，以确保最大的磨损性。
JMD abrasion Guard is extruded of high-density polymer, by a patented process, to ensure maximum abrasion resistance.
近二十年来，国内关于SBS、SBR等聚合物改性沥青的研究较多，但关于外掺剂沥青和特制沥青的研究几乎为空白。
In the recent 20 years, there are many studies on the polymer modified bitumen, such as SBS and SBR in the country, but the study on the modified agent is almost a blank.
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