GBT4270-1999-技术文件用热工图形符号与文字代号.pdf

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1、ICS.01.080.20F,U4中华人民共和国国家标准GB/T4270-1999技术文件用热工图形符号与文字代号Graphicalsymbolsandlettercodesforthermalengineeringinthetechnicaldocumentation1999-11一23发布2000一05一01实施国家质IR技术监督局发布Gs/T4270-1999目次前言···························································‘···”···“·····

2、····························”······⋯⋯，1范围······················，··················································································，···⋯⋯12弓(用标准···········，················‘······················‘···········，.····，，········“····，，·，········一13定义·

3、·················”······，·····················”···························，··，·····“‘···············，·····，·⋯14热工图形符号·”··················································································”····⋯⋯25热工文字代号·············································

4、········“···················，.··············⋯⋯9附录A(提示的附录)索引···································”·································“·······一22GB/'r4270-1999前言本标准是对GB/T4270-1984《热工图形符号与文字代号》的修订版。标准修订时参考了GB/T2625-1981《过程检测和控制流程图用图形符号和文字代号》,GB/T6567-1986《管路系统的图形符号》及G

5、B3102.1-GB3102.12-1993《量和单位》

6、1.在管路图形符号中，修改了原有管的图形符号，增补了保温管、保护管、夹套管、伴热管、被遮蔽管等图形符号。2.增补了管路连接的图形符号，其中包括螺纹连接、法兰连接、相交管、交叉管、变径管等。3.在阀门的图形符号中，修改了针形阀，删去了调节阀、插板阀，增补了自力式压力控制阀。4.在执行机构图形符号中，修改了电磁执行机构，删去了气动执行机构和液动执行机构，增加了数字执行机构、活塞执行机构.将薄膜执行机构分为带弹簧的、不带弹簧的两种执行机构，以带弹簧的执行机构为例，又细分为带手轮的、带气动阀门定位器的、带电气阀门定位器的、带

7、人工复位装置的、以及带远程复位装置的执行机构。5增补了热工测量元件及仪表的图形符号。第4是对热工文字代号进行了修改、补充和完善，修订版主要遵照了GB3102.1^-3102.12-1993中有关文字代号。另外，根据GB3102.1-3102.12-1993的规定，将原标准中的无量纲准数改为特征数，并将特征数按动量传递、热量传递、双组分混合物中的质量传递及物性常数4个方面内容列出。本修订版最后还增补了热工过程检测与控制系统常用的英文缩写词。本标准附录A是提示的附录。本标准由全国能源基础与管理标准化技术委员会提出并归口。

8、本标准起草单位:中国科学院工程热物理研究所、中国标准化与信息分类编码研究所。本标准主要起草人:杨振顺、陈铭净、李绍义、欧阳坤、徐邦煦。中华人民共和国国家标准技术文件用热工图形符号与文字代号“/T4270-1999Graphicalsymbolsandlettercodesofthermalengineering代替GB/T4270-1984in