这句翻译不知道怎么处理,请大家指教!pitting of valve? where practical "roll" or "drop-out" all control valves to prevent pitting of the valve seats due to deposition of debris on the seat. 这里pitting不是点蚀,应该是凹痕或麻坑,debris可能是金属碎屑、焊渣等硬物,阀座这里可能指阀座密封面,在阀门开闭过程阀片压在金属碎屑是会造成凹痕的。 roll摇晃,drop-out甩出查看更多