采用浇注型聚氨酯材料，设计了一种管道用胀环试样试验台主密封圈。
Manufactured by casting polyurethane, main seal ring used in expansion ring testing device for pipeline was designed.
详细介绍了用扩冲法对液压胀形出现凹形的护环进行修复的方法。
This article has described expanding method for repairing the concave retaining ring caused by the hydraulic bulging.
塑料活塞环结构参量的设计是在缸径为已知量的前题下，分别对活塞环厚度、活塞环轴向高度、活塞环线胀量等进行设计。
The parameter design of the plastic piston ring refers to designing the piston ring thickness, piston ring axial height and piston ring linear expansion in case that the cylinder bore is known.
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