It is no need to maintenance under normal circumstance. It should be serviced by professional when repaired.

在正常操作条件下，压力阀是不用维修的，特殊情况需要维修时，应由专业人员来进行。

youdao

It is no need to maintenance under normal circumstance. It should be serviced by professional when repaired.

在正常操作条件下，压力阀是不用维修的，特殊情况需要维修时，应由专业人员来进行。

youdao