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。
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.
指出螺栓联接的扭紧力矩值不仅与螺栓的公称直径及性能等级有关，还与能否保证联接可靠工作有关。
The value of tightening torque is relative not only to the nominal diameter and quality class of the bolt, but also to the security of the threaded fastener.
对比试块应从与待检材料有相同的公称外径、材质和热处理状态的棒或管上制取。
The reference standard, of convenient length, shall be prepared from a length of bar or tube of the same nominal outside diameter, material and heat-treatment as the material examined.
钢板按理论重量交货，用公称厚度加表2所列的附加值作为计算重量的理论厚度。
Plates shall be ordered to theoretical weight, the added value to nominal thickness listed in Table 2 plus nominal thickness shall be the theoretical thickness for weight calculation.
它必须安装在公称压力不超过这个额定压力的管道系统中。
It must be installed in a piping system, where the normal pressure does not exceed this rating.
主要提出以下观点：锅炉吊杆用螺母的高度与螺纹公称直径之比不宜小于1。
Presents the following viewpoints:the radio between the height of the nut for boiler hanger rod and the diameter of screw shall not be less than 1.
注：（1）公称流量是水表在规定误差限内允许长期工作的流量。
Note:(1)Rated flux is the permitted flux in the long work situation for the water meter.
本文对产生这种差别的原因进行了分析，并给出了从空气测量数据到实际公称容量值的换算关系。
The reason of the difference is analyzed and the conversion formula from the air test value to the real capacity is given in this paper.
针对断面尺寸偏离图纸公称尺寸的情况和噪声的存在，给出了识别正确性的理论分析。
The accuracy of the method is discussed in theory, given the deviation of profile dimensions from their standard dimension and the existence of noise.
对于公称通径大于8英寸的蝶阀，如果是在液体中使用，则在关闭阀门时，动态扭矩有比较明显的增加。
Butterfly valves, sizes 8 "and larger, when used on liquids, show a marked increase in dynamic torque which tends to close the valve."
对于公称通径大于8英寸的蝶阀，如果是在液体中使用，则在关闭阀门时，动态扭矩有比较明显的增加。
Butterfly valves, sizes 8 "and larger, when used on liquids, show a marked increase in dynamic torque which tends to close the valve."
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