亚洲欧美综合中文字幕国产_国产一区二区三区91免费播放_又硬又粗又黄小色网视频_韓國精品一區二區久久_欧美亚洲日韩视频高清_草莓视频无码成人免费下载观看_热播综艺动漫四季AV_日韩中文字幕一区二区久久_四虎成人高清在线视频_国产剧情演绎丝袜在线播放

The factory production of proportional valve, beautiful appearance, reliable quality, accurate, steady work, both under pressure and anti-static pressure. The valve uses the valve body internal cross-sectional area of the piston at both ends of the pressure difference, changing the pressure after the valve to achieve decompression purposes. I decompression valve factory decompression ratio: 2: 1,3: 1,4: 1,3: 2,5: 2, etc., can also be designed according to the requirements of the user a special proportion of the valve. 

Standard sizes