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Single axial expansion joint are most commonly used for axial compression and extension but may also be designed for lateral offset and angular movement.
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Single bellows and structure compose single axial expansion joint, which is the simplest and most universal expansion joint. It’s used to the application with axial movement, lateral, angular and universal movement. Single axial expansion joints have limited compensation except axial movement. Pressure thrust is not applicable.
Bellows loading external pressure and structure of outer pipe and end plate compose the externally pressurized single axial expansion joint, which is used to absorb axial movement. The pressure thrust is not applicable. In the respect of absorbing axial movement, externally pressurized single axial expansion joint is better than single expansion joint . Besides, because of the existence of the outer pipe, the bellows can be protected from other objects contact or mechanical damage.
Single bellows and hinge pin, hinge plate and other structure compose single hinged expansion joint, which is used to the application of angular movement in a plane and pressure thrust.
Single bellows, hinged pin, hinged plate, gimbal plate, and vertical plate compose single gimbal expansion jont, which is used to the application of angular movement in arbitrary plane and pressure thrust.
Two bellows connected to spool pipe and structure compose double untied expansion joint, which is used to the application of axial movement and lateral movement. Pressure thrust is not application.
Two bellows connected to spool pipe, and structure of rods, end plate and spherical or conical gasket compose double tied expansion joint, which is used to the application of lateral movement in arbitrary plane and pressure thrust.
Two bellows connected to spool pipe, and structure part of hinged pin, hinged plate and vertical plate compose double hinged expansion, which is used to the application of lateral movement in a plane and pressure thrust.
