Metal Expansion Joint
Elbow Or Tee Dual-Flex and Universal Series PBEU
Keyser Pressure Balanced elbow model PBEU, functions on the same principle as the PBES model, with the exception that it has a universal flow bellow design. Commonly used when large amount of lateral movements are required or when the lateral force must be held to a minimum. In this design, two bellows are used in the flow end of the expansion joint and single bellows in the balancing end.
Pressure balanced joint has lateral pipe connection that can move easily between two bellows.
The use of the connecting pipe from the elbow/tee for the balancing bellows must be large enough to assure rapid equalization of the pressure from balanced bellows with the pressure of the universal flow bellows.
Keyser PBEU series is used to absorb external lateral movement without impairing loading on the system when a pressure line that connects to a component is subjected to a large amount of lateral deflection. A universal bellow is placed at the flow end with a single bellow in the balancing end, joint by 4 tie rods. These tie rods pivot at their attachment joints. The lateral movements is taken by the flow bellow in the same manner as a tired universal expansion joint.Pressure balanced joint has lateral pipe connection that can move easily between two bellows.
Gilding and anchoring construction in a Keyser PBEU universal pressure balanced expansion joint system
The diagram at the side shows a typical application of a pressure balanced expansion joint for combined axial movement and lateral deflection. The anchor on the piping run and that on the turbine are intermediate anchors and only directional guiding is required. By proper design, the guide directly above the turbine can be made to absorb the axial movement forces of the expansion joint without transmitting these to the turbine. The only force imposed on the turbine is that which is required to deflect the expansion joint laterally.
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