这种设计密封可靠，适用管径范围广，能满足一定压力管道使用要求。
The design has the advantages of reliable sealing, wide application range of pipe diameters and the ability to meet certain operating requirements of pressure pipelines.
生产实践证明，此装置具有适用管径范围大、结构简单、节能、成型质量好等特点。
It is proved that the apparatus has the features of good suit-ability for wide ranges of pipe diameters, simple structure, energy saving and better forming quality.
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