亚洲欧美日韩天美国产传媒蓝导航_亚洲欧美中文日韩v在线观看_欧美已满18点击进入在线看片_乱伦欧美三级自拍_国产色婷婷五月精品综_天海翼一区二区三区高清视频_强奷乱码中文字幕熟女不卡_国产精品h在线播放_我们整理并发布的欧美日本在线观看_国产黄色网站不卡免费看

該系列是一種閥板為部分球面的偏心角行程調(diào)節(jié)閥，與球型調(diào)節(jié)閥相比較，具有小型量輕、閥容量大、可調(diào)比高等特點(diǎn)。

This series provides eccentric segmental ball valves for modulating application. Comparing to globe valves, the body is compact, light weight, and yet it has large Cv value and large rangeability.