In some sectors certain operating conditions (such as the petroleum sector, pipeline), not allowed to use the path contraction of the valve.
在某些部门的某些工作条件下(如石油部门的输油管线)，不允许采用通径收缩的阀门。
In some sectors certain operating conditions (such as the petroleum sector, pipeline), not allowed to use the path contraction of the valve.
在某些部门的某些工作条件下(如石油部门的输油管线)，不允许采用通径收缩的阀门。
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