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 with ball bearing,is in the United States FMC company transfer of technology digestion,absorption and production of technical innovation on the base of series products.Its specifications are 1 "-4",the rated working pressure of 25-140 mpa (3626psi-20000psi),can provide the normal temperature,low temperature andsulfurous gas under the condition of using various types of elbow and repair kits.