在这些活塞中，活塞环的数量减少到三个，即两个气环，一个油环。
On these pistons the number piston rings was reduced to three, two compression and one oil-control.
清洁活塞环槽或油环开缝，绝对不能损伤金属部分。
Be sure that you do not remove metal when cleaning ring grooves or oil slots.
事实上有两种活塞环，气环和油环。
Actually, there are two types of rings, compression rings and oil-control rings.
事实上有两种活塞环，气环和油环。
Actually, there are two types of rings, compressed rings and nil-control rings.
本公司能够生产高质量的翻边瓦 内孔拉轴瓦 小孔钢质油环（活塞环）等，产品达400多种．主要销往欧洲、拉美、中东、俄罗斯和东南亚等国家。
There are more than 400 kinds of such products, It mainly sells to Europe, Latin-America, Middle-East, Russia and Southeast Asia.
本公司能够生产高质量的翻边瓦 内孔拉轴瓦 小孔钢质油环（活塞环）等，产品达400多种．主要销往欧洲、拉美、中东、俄罗斯和东南亚等国家。
There are more than 400 kinds of such products, It mainly sells to Europe, Latin-America, Middle-East, Russia and Southeast Asia.
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