Changsha Zhengsheng Special Piston Ring Co.Ltd-ZSPR, One of the Top Manufacturers of marine diesel Piston Ring, compressors Piston Ring ,engineering machinery piston ring and all type of piston ring casting in China with a history of more than 60 years.It introduced into advanced technologies from German Goetz Company and British AE Company.And ZSPR has set down product quality regulations according to QS-9000 and ISO-9001.

ZSPR is the designated component supplier for China Railway Ministry and China National Marine Cooperation. And It is  the main piston rings supplier for most of the high power diesel engine factories of China. It also can supply a wide range of piston ring,like MAN,B&W,MTU,MAK,DAIHASU,PIESTICK,SULZER,YANMAR,MWM.ZSPR can be the supplier for Engine Makers (OEM), and can design and process products according to customers requirements(drawing or sample).

The largest single application is for marine diesel engines .However, ZSPR also supply piston rings for many other applications including:
      Ship diesel engines
      Diesel engine generators
      Diesel railway locomotives
      Oil rigs
      Air compressors
      Pile driver
Products manufactured in ZSPR have a wide range of different types. These include: plain, barrel face, keystone, taper faced, torsion, under cut, coil expander, oil control and combined rings.

ZSPR also supply all type of piston ring casting, it has developed its own material series, ranging from low and medium grade to high grade with full specifications to meet different engine needs.
      gray cast iron
      Alloy cast iron
      Ductile cast iron
      Vermicular graphite cast iron
      Malleable,semi-malleable iron
      steel ring
      Metal ceramic

The following are different types of coatings which are commonly supplied by ZSPR:
      Chrome plating
      phosphate coating
      copper plating
      tin plating
      ceramic chrome plating
      plasma sprayed coating