前言阀体是构成阀门最重要的零件。不用说,它和其它的管系附件一样与管路直接连接,并与阀盖一起构成阀门的壳体来保持压力,此外,按阀门的作用即控制流体所不可缺少的阀座也直接或间接地设置其上,从而达到并完成阀门预期要求的性能和作用。对阀门来说,虽然阀体是最重要的零件,但国内外诸标准(以下为方便起见把标准号、说明书及标准通则等均称作标准)中,有关阀体设计的具体规定极少,本文的标题虽说是对各种标准的比较,但由于资料不多,仅从国内 Preface The body is the most important part that forms the valve. Needless to say, it is connected directly to the pipe like other pipe fittings, and forms a valve housing together with the bonnet to maintain the pressure. In addition, the valve seat, which is indispensable for controlling fluid, is also directly or indirectly Set up on it, so as to achieve and fulfill the desired performance and function of the valve. The valve, although the body is the most important parts, but the domestic and international standards (the following for the sake of the standard number, brochures and standard rules are called standards), the valve design of the specific provisions of very small, Although the title of this article is a comparison of various standards, but because of little information, only from the country