Curved tube pressure balance expansion joint

 

 

 

The main advantage of the pressure-balanced expansion joint is that it absorbs the axial displacement from the outside without causing the system to be pushed by the internal pressure. The force caused by the overall stiffness of the bellows is not eliminated. In fact, this force is generally more than the elastic force caused by the displacement of the single expansion joint. Because both the working bellows and the balance bellows are compressed or stretched, the force acting on the pipe or equipment is the combined axial force of the two.

 

 

 

Installation case 1

 

 

 

 

 

1), figure 4 is being used when the combination of axial and transverse displacement bent pipe pressure balance type expansion joint of the typical examples, in the end of tube and stent on steam turbine are intermediate fixed bracket, and only need to use the guide bracket, with reasonable design can make the turbine at the top of the guide bracket of the axial displacement of the expansion joint under force, to avoid the force used on the steam turbine effect on steam turbine only function of lateral displacement of the expansion joint

 

2. FIG. 5 shows a common case where the pressure balance expansion joint is very suitable for elbow pipe. In process operation, the expansion amount of vessel and vertical pipe may be different. Install a pressure-balanced expansion joint as shown in the diagram. The displacement difference in the vertical direction can be absorbed by the axial displacement of expansion joint, and the thermal expansion between the vessel center line and the pipeline can be absorbed by the lateral displacement of expansion joint