I produced the internal and external pressure balanced expansion joint to compensate Features 1. Multi, multi-dimensional direction can provide greater compensation in the smaller size range. ??? 2. energy saving low noise, can effectively reduce the fan and other system noise, vibration and energy saving. ??? 3. No reverse thrust, the main material for the fabric, inability to transfer. Make pipes and equipment projects to avoid the use of larger bearings, save a lot of materials and labor, improve the safety of equipment and systems. ??? The use of polymer materials coated with organic silicon, fluorine and other treatment, with excellent high temperature resistance, corrosion resistance and sealing performance, anti-fatigue, anti-aging. ??? 5. Installation is simple, easy replacement without demanding pair, without lifting the replacement equipment, the time is short. ? External pressure balanced bellows is working from the inside pressure wave and a wave composed of external pressure balance, small size, its column buckling wave number than the straight pipe pressure balance compensators doubled since the middle of the two groups by the outer bellows pressure effect, good stability. Model: Our production DN100-DN1200, pressure level 0.6Mpa-2.5Mpa?