通径收缩能使零件尺寸缩小，开、闭所需力相应减小，同时可扩大零部件的应用范围。
Path shrink parts sizes shrink, open and close the required power is reduced, at the same time expand the scope of application components.
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.
这一方面是为了减小管线的阻力损失，另一方面是为了避免通径收缩后给机械清扫管线造成障碍。
This aspect is to reduce the pipeline pressure loss, the other is to avoid the path contraction obstacle to the mechanical cleaning pipelines.
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