The piston rings carried in the ring groove are of two basic types: compression rings and oil-control ring.
安装在环槽中的活塞环有两种类型：压缩环和机油环。
Particularly suitable for single compression, double compression ring compression and welding type pipe fittings.
特别适用于单卡压、双卡压、环压、焊接等不锈钢管件生产。
The results show that the toroidal shell is a good type of compression ring for large scale storage tanks as well.
实验还表明对于大型拱顶储罐，采用圆环壳型的承压圈有较好的承载能力， 这是一种合理的结构型式。
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