99国产揄拍国产精品人妻,国产激情内射在线影院,国产在线拍揄自揄拍免费下载,日韩欧美亚洲国产AY

Overview：YDF series valve with three-phase asynchronous motor, according to China's latest motor standard JB1009-1012-91 and safety standards GB12350-2000 design, with high starting torque, high efficiency, low noise, solid structure, long life, easy maintenance advantages. It is suitable for ordinary place where there is no explosive hazard mixing, and is used as electric valve driving element.