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Angular movement is the rotational displacement of the longitudinal axis of the bellows toward a point of rotation or flexion of the expansion joint along its center line.
Angular expansion joints are those that are equipped with hinges or cardan that allow absorbing the angular movement for which they are designed and restrict the internal pressure thrust. They absorb angular movement in a single plane when equipped with hinges and angular movement in several planes when equipped with a cardan system.
The most commonly used expansion joints to absorb angular movements are the following:
These expansion joints are made of one single bellows element fitted with welding ends or flanges plus a system of articulated supports which allow for angular movement in one plane only. The hinge mechanism is designed to accept full pressure thrust.
These units do not allow axial movement however, some types of hinge systems can be provided with holes for the hinge pin that are slotted to allow limited axial displacement. These “slotted hinge” types can not resist the pressure thrust forces and therefore proper anchorage must be provided.
Hinged expansion joint with welding ends.
Hinged expansion joint with flanges.
This model is designed to absorb lateral and angular movements in only one plane.
It is made up of two bellows joined together by a linking pipe and fitted with welding ends or flanges plus a double articulated system.
The hinge mechanisms are designed to contain pressure thrust.
Double Hinged expansion joint with welding ends.
Double Hinged expansion joint with flanges.
Gimbal Expansion Joints are designed to allow angular movement in any plane by the use of two pairs of hinges affixed to a common floating gimbal ring. The gimbal ring, hinged and pins are designed to restrain the pressure thrust due to internal pressure and shear forces.
A gimbal ring is either round or square. For round gimbals the torsional moment shall be considered and for square gimbals the instability due to the bending shall be considered.
Gimbal expansion joint with welding ends.
Gimbal expansion joint with flanges.
Designed to absorb lateral movements in any direction and angular movements in one plane only. This model is made up of two bellows joined together by a linking pipe and a universal system of double articulated supports.
Double Articulated expansion joint with welding ends.
Double Articulated expansion joint with flanges.
Designed to absorb lateral and angular movements in any direction. This model is made up of two bellows joined together by a linking pipe and a double cardan system.
A double gimbal expansion joint is basically a two single gimbal expansion joints and an intermediate pipe that joins them. This type of Expansion Joint can absorb a large lateral movement in any plane and angular movement in any direction.
Double gimbal expansion joint with flanges or welding ends.
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