Hinged Expansion Joint for applications with angular movements about one axis
As the name implies, a Hinged Expansion Joint has one bellows, can be either non-equalizing or self-equalizing type, and is designed to permit angular rotation in only one plane by the use of a pair of hinges attached to the ends of the Expansion Joint. The hinge pins have a common axis perpendicular to the longitudinal centerline of the bellows and located exactly in the center of the bellows length. Hinges must be designed to withstand the full pressure thrust load plus any other external forces, such as the weight of the piping, the wind loads, the force to deflect, and so forth, which will be applied. Hinged Expansion Joints should be used in pairs, or sets of three, to function properly.
The use of Hinged Expansion Joints not only reduces thrust loads applied to anchors, but may also permit installation of anchors at more advantageous locations. Their use, however, does not eliminate the installation of adequate alignment guides.
Swing Type Expansion Joint:
A Swing Type Expansion Joint is a modification of the Hinged Expansion Joint, in which two bellows are attached to a common center nipple, and the outboard ends of the assembly are tied together by the use of two swing bars attached to the ends by hinge pins. This type of unit is designed to absorb lateral deflection and/or limited angular rotation in one plane only.
Gimbal Type Expansion Joint:
A Gimbal Type Expansion Joint (or Gimbaled Expansion Joint) is another variation of the Hinged Type Expansion Joint.To know more Click Here