关于反向角的问题?API618中有一句话:Some bushing designs (such as grooved bushings) have proven reliability with as little as 15 degrees of rod reversal at 3% magnitude.Simple bushing designs (un-grooved) may require a minimum of 45 degrees of rod reversal and a 20% magnitude. The manufacturer shouldprovide the actual requirements to the purchaser at the proposal stage.这里的magnitude是什么?查看更多5个回答 . 6人已关注