国产精品久久久久野外,亚洲中文超碰中文字幕,无码人妻视频又大又粗欧美,人与狗精品AA毛片

 The general explosion-proof multi-turn valve electric actuator-XZA series is always used to gate valve, stop valve and diaphragm valve. which drive the valve plate move straight forwards. If  XZA series combine with the second grade reducing mechanism such as turbine and gear reducer ect, the combination can be used to control the quarter-turn valve, such as butterfly valve , plug valve etc.