D343H美标蝶阀产品介绍：
   D343H美标蝶阀的蝶板安装于管道的直径方向。在蝶阀阀体圆柱形通道内，圆盘形蝶板绕着轴线旋转，旋转角度为0°-90°之间，旋转到90°时，阀门则呈全开状态。

是用双头螺栓将阀门连接在两管道法兰之间，其结构简单、体积小、重量轻，只由少数几个零件组成。而且只需旋转90°即可快速启闭，操作简单，同时该阀门具有良好的流体控制特性。蝶阀处于*开启位置时，蝶板厚度是介质流经阀体时*的阻力，因此通过该阀门所产生的压力降很小，故具有较好的流量控制特性。蝶阀有弹密封和金属密封两种密封型式。弹性密封阀门，密封圈可以镶嵌在阀体上或附在蝶板周边。

应用范围：
蝶阀不仅在石油、煤气、化工、水处理等一般工业上得到广泛应用，而且还应用于热电站的冷却水系统。

标准规范：
设计制造标准：GB/T 12238-2008、ANSI B16.34、API609、MSS SP-68、JIS B2032、JIS B2064
结构长度标准：GB/T 12221-2005、API609、JIS B2002
连接法兰标准：GB/T 9113、JB79、SH3406、HG20592、ASME B16.5、ASME B16.47、API605、JIS B2212
压力温度等级：GB/T 12224-2005
试验检验标准：GB/T 13927-2008、API598、JIS B2003

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