DN
40506580100125150200250300最小长度140140160180200200220240260280安装长度170170205225250250270290315340最大长度200200250270300300320320370400
DN
3504004505006007008009001000120014001600最小长度290300320320350370390420440490520550安装长度350360385385415440460495515470605640最大长度410420450450480510530570590650690730
注：表中DN尺寸可根据用户需要生产。