活动弯头是一种装有滚珠轴承的金属管线接头，是在美国FMC公司转让技术基础上进行消化吸收和创新生产的系列产品。
其规格有1″~4″，额定工作压力25~140Mpa(3626psi~20000psi)，可提供常温、低温和含硫气体条件下使用的各种型号活动弯头及修理包。

Bend is a kind of metal pipe joints withball bearing,is in the United States FMC company transfer of technologydigestion,absorption and production of technical innovation on the base ofseries products.Its specifications are 1 "-4",the rated workingpressure of 25-140 mpa (3626psi-20000psi),can provide the normaltemperature,low temperature andsulfurous gas under the condition of usingvarious types of elbow and repair kits.