rubber expansion bellows 1.DN32mm~DN5000mm 2.ISO9001,ISO14001 3.ANSI,BSP,ISO standard 4.12 years producing experience rubber expansion bellows,rubber duct joint,rubber expansion bellow 1,FunctionsFabric expansion joints are used for absorbing movements between joining connections in gasconveying ducts and pipe-lines. The movements can be caused by thermal expansion of theducting system, wind ...