7.types of joints :  1, both ends are external joints  WW type   

                 2, both ends are internal joints   NN type

                 3, one end is external joints , the other with bottom   WDtype   

                 4, both ends are side cut from the trough  QdQd type
,Certification ISO9001:2008

Copper Bellows:
1) Balances and compensates to prevent displacement or vibrations in extreme temperatures, pressure, or thrust.
2) Used extensively in all facets of the high-tech steel industry as well as other industries.
3) Have good flexibility and handle extreme temperature and pressure well.
4) They can play an important role in hose reciprocating motion, thermal expansion absorption, vibration absorption and adjusting compound tube center.