该系列是一款90°((±5°可调)部分回转手动驱动装置。适用于球阀、蝶阀、旋塞阀等类型阀门。箱体采用球墨铸铁，样式新颖、外型美观。法兰全部采用ISO 5211国际标准，与阀门配套更加方便。环境温度：-20℃到+120℃（-4°F到+248°F）。

    The series is a 90° (+ 5 degree adjustable) part of the rotary manual drive device. Suitable for ball valves, butterfly valves, plug valves and other types of valves. The box is made of nodular cast iron with novel style and beautiful appearance. Flange all using ISO 5211 international standards, and the valve is more convenient. Ambient temperature