According to the content of section 412 of (CB/127-200 ( metal bellows expansion joint general technical conditions corrugated compensator ), the compensator that absorbs the axial displacement mainly has the following four types single shaft Directional compensator , straight pipe pressure balance type compensator, bypass straight pipe pressure balance type compensator and axial type compensator.
single axial type compensator is composed of a bellows and mechanical components. It is used to absorb axial displacement but cannot withstand the pressure thrust of bellows.
Straight pipe pressure balance compensator consists of two working bellows at both ends and a balancing bellows in the middle, as well as structural parts such as tie rods and end plates. It is used to absorb axial displacement and balance bellows pressure thrust.
bypass straight pipe pressure balance compensator is composed of two identical bellows and end rings, head , outer tube and other structural parts. It is mainly used to absorb the shaft.
The axial compensator is composed of a bellows, outer tube, end ring and other structural parts that bear external pressure. It is mainly used to absorb axial displacement and balance the pressure thrust of the bellows.
Table 2 of (CJ/T402-2012) "Corrugated Compensator for Urban Heating Pipelines" shows that there are six types of axial corrugated compensators: internal pressure type axial compensator, external pressure type axial compensator, direct buried type Type axial compensator, primary compensation type axial compensator, bypass pressure balance type axial compensator and straight pipe pressure balance type axial compensator
GBT12777-2008 and CJT402-2012 classification of axial corrugated compensator. The single axial compensator is the internal pressure axial compensator (CJIT4022012) "Corrugated Compensator for Urban Heating Pipes" adds two types of directly buried corrugated compensators. The corrugated compensator is directly buried in the soil and is used to compensate for the thermal displacement of the pipeline. The primary compensation compensator is only used to compensate for the displacement during preheating of the directly buried pipeline. After the displacement is in place, it is welded into a whole to bear the pipeline load.
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