欧美日韩久久中文字幕,在线观看国产精品日韩av,在线天堂bt种子,波多野结衣福利在线,射插插插免费视频,国产精品自拍小视频,少妇被又大又粗又爽A片

BA series valve manual device, is a multi-turn valve actuators. It is suitable for gate valves, globe valves and other types of valves. Stem nut thread forms and sizes are usually processed by the user depending on their own with the valve. High transmission efficiency, easy to install