99国内精品久久久久久久,亚洲色偷偷色噜噜狠狠99网,熟睡人妻被讨厌的公侵犯深田咏美 ,亚洲欧美综合在线一区

QZ series valve pneumatic device for the pneumatic actuator output angle of 90 ° agencies, can be composed of pneumatic valves and ball valves, butterfly valves, also applies to the 90 ° rotation of other mechanical devices. It can be widely used in petroleum, chemical, food, pharmaceutical, textile, paper, power generation, shipbuilding, metallurgy, gas and water supply and drainage systems automation devices .