The inner surface of small caliber cylinderpacking of ships are applied with strengthening treatment by means of laser coating and surface modification techniques to improve their performances.
采用激光熔覆、表面改性技术对舰船特种小口径缸套的内表面进行强化处理，提高其综合性能。
2
This kind of air compressor cylinder basically does not include any oil content in, the piston ring and packing is commonly ptfe.
这种空压机气缸中基本上不含油，其活塞环和填料一般为聚四氟乙烯。
3
No. 3 cylinder checked and piston drawn out, packing renewed.