标 准 编 号：ASME B16.20-2007 简体中文标题：管法兰用环垫式、螺旋缠绕式和夹层式金属垫片繁体中文标题：管法兰用环垫式、螺旋缠绕式和夹层式金属垫片English Name：Metallic Gaskets for Pipe Flanges - Ring Joint, Spiral Wounds and Jacketed
