Yes, type "U" refers to Unknown for the Nominal Annual Rate.
是的，“U”型指的是未知的名义增长率。
J41N Type PN40 steel globe valves: manual, flanged, straight-through, the valve seat sealing surface material as nylon plastic, nominal pressure PN40, carbon steel valve body material cut-off valve.
J 41 n型PN 40钢制截止阀：手动、法兰连接、直通式、阀座密封面材料为尼龙塑料、公称压力pn 40、阀体材料为碳素钢的截止阀。
Nominal diameter and flow valves, basically the same breath for full-bore type, Circulation than nominal diameter valve is given. it small called non-reducing type.
流道孔径与阀门公称通经，基本相同的为全通径式；流通孔径比阀门公称通经小的称为缩径式。
According to the fatigue type, use safe-life design method to study tower crane's fatigue, and choose nominal stress approach to estimate the life of tower crane.
并根据其疲劳类型，确定选用安全寿命设计方法对塔式起重机钢结构进行疲劳分析，并应用名义应力法估算塔式起重机钢结构的疲劳寿命。
We mainly produce "Far East" brand and "aotu" brand opened-type and closed-type small and medium-size presses of nominal pressures from 6300kn.
公司主要生产“远东”牌开式、闭式中小型压力机，公称压力从63kn到6300kn，目前产品有十一个系列六十多个品种。
It's suitable for the small caliber valve nominal diameter: airproof test and strength test of DN15/100 flange type, through-type gate valve, cut-off valve and ball valve etc.
适用于小口径阀门通径：DN15/100法兰式、直通式闸阀，截止阀，球阀等阀门的密封测试和强度测试。
It's suitable for the small caliber valve nominal diameter: airproof test and strength test of DN15/100 flange type, through-type gate valve, cut-off valve and ball valve etc.
适用于小口径阀门通径：DN15/100法兰式、直通式闸阀，截止阀，球阀等阀门的密封测试和强度测试。
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