译文：
通用阀门必须使用的和可选择使用标志项目，如下列表所示。对于手动阀门，如果手轮尺寸够大，则手轮上应设有指示阀门关闭的箭头或附加“开”“关”的字样。 通用阀门标志项目（GB12220）：公称通径（DN）；公称压力（PN）；受压部件材料代号；制造厂名或商标；介质流向的箭头；密封环（垫）代号；极限温度（℃）；螺纹代号；极限压力；生产厂的编号；标准号；熔炼炉号；内件材料代号；工位号；衬里材料代号；质量和试验标记；检验人员印记；制造年、月；流动特性。 通用阀门的具体标志规定如下： （1）上表1-4项是必须使用的标志，对于DN≥50mm的阀门，应标记在阀体上；对于DN≤50mm的阀门，标记在阀体上还是铭牌上，由产品设计者规定。 （2）上表5和6项只有当某类阀门标准中有此规定时才是必须使用的标志，它们应分别标记在阀体及法兰上。 （3）如果各类阀门标准中没有特殊规定，则上表7-19项是按需要选择使用的标志。当需要时，可标记在阀体或标牌上。 对于减压阀，在阀体上的标志除按上表的规定外，还应有：a：出厂日期；b：适用介质；c：出口压力。 蒸汽疏水阀按下表规定，标志可设在阀体上，也可标在标牌上。蒸汽疏水阀的标志（GB12249）必须使用的标志： 产品型号；公称通径；公称压力；制造厂名称和商标；介质流动方向；{zg}工作压力；{zg}工作温度。 可选择使用的标志：阀体材料；{zg}允许压力；{zg}允许温度；{zg}排水温度；出厂编号、日期。 安全阀的标志（GB12241） 阀体上的标志：公称通径DN；阀体材料；制造厂名或商标；当进口与出口连接部分的尺寸或压力级相当时，应有指明介质流动方向的箭头 标牌上的标志：阀门设计的允许{zg}工作温度（℃）；整定压力（MPa）；依据的标准号制造厂的基准型号；额定排量系数或对于基准介质的额定排量；流动面积（mm2）；开启高度（mm）超过压力百分数。

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原文：
Universal valve must be used and can choose to use logo items, as shown in the table. For manual valves, if the hand wheel size is large enough, then there should be instructions on the hand wheel valve closed arrows or additional "open" "close" message. Universal Valve Logo Program (GB12220): Nominal diameter (DN); Nominal pressure (PN); compression component materials, code-named; manufacturer name or trademark; medium flow arrows; seal ring (pad) Code; limit temperature (℃ ); thread code; limit pressure; production plant number; standard number; smelting furnace number; inner parts material code; station number; lining material code; quality and testing mark; inspectors imprinting; manufacture, month and year; flow characteristics. A specific hallmark of common valve as follows: (1), table 1-4, one is a sign must be used for DN ≥ 50mm valves should be marked on the body; For DN ≤ 50mm valve, marking on the body or the nameplate on product design by those requirements. (2) in Tables 5 and 6 only when certain types of valve standards, there is this requirement is to use the logo, they should be separately marked on valve body and flange. (3) If there are no special standards for various types of valve provision, then the above table entries are based on need 7-19 choose to use sign. When necessary, can be marked on body or plate. For the valve, the valve on the signs in addition to the provisions of the table, there should be: a: ex-factory date; b: for medium; c: outlet pressure. Steam Traps table below provides the sign may be located in the body can also be marked on the plate. Steam Traps logo (GB12249) must use the logo: Product model; DN; PN; manufacturer names and trademarks; medium flow direction; maximum working pressure; maximum operating temperature. Either choose to use the logo: body material; the maximum allowable pressure; the maximum allowable temperature; the maximum drain temperature; serial number, date. Safety Valve logo (GB12241) Valve on the signs: nominal diameter DN; body material; manufacturer name or trademark; when the import and export connections part of the size or the pressure levels were equal, there should be arrows indicate the flow direction of medium Signs on the signs: valve design allows maximum working temperature (℃); the entire set pressure (MPa); based on the standard factory No. benchmark model; nominal discharge coefficient or for a rated displacement of the base medium; flow area (mm2 ); opening height (mm) over the pressure percentage.