This expansion joint is the simplest one available and comes with one bellows section and end connections. This type of expansion joint requires the most control of the adjacent piping in regards to anchors and guiding.
UNIVERSAL EXPANSION JOINT
This expansion joint has two bellows sections connected by a center pipe section. This design allows for large amounts of lateral deflection. The universal can also allow for axial and angular movements in addition to the lateral movement. This expansion joint does not come with the hardware to resist pressure thrust. Like the single unrestrained expansion joint the universal expansion joint must be properly anchored and supported.
SINGLE TIED EXPANSION JOINT
This expansion joint is exactly like the single unrestrained expansion joint but it is provided with tie rods. When adding tie rods to the expansion joint it stops the bellows from overextending. The tie rods act as limit rods and has stops set to allow axial movement to a specifically designed movement.
TIED UNIVERSAL EXPANSION JOINT
This expansion joint is exactly like the universal expansion joint but the tie rods have been designed into the unit. By adding the tie rods you restrain pressure thrust. The pressure balance expansion joint will not accept external axial movement without overcoming this pressure thrust force.
PRESSURE BALANCED ELBOW EXPANSION JOINT
This expansion joint is designed to not only restrain the pressure thrust but in addition, balances the pressure thrust so as not to have anchoring of the adjacent piping or equipment. This pressure balanced elbow expansion joint can be designed as single or universal depending on how much lateral movement is required.
GIMBAL EXPANSION JOINT
This expansion joint has a single bellows section. The gimbal expansion joint is designed to allow angular rotation in any plane by using two pairs of hinges connected to a common central floating ring. The gimbal expansion joint is usually used in pairs of threes or in combination with the hinged expansion joint.
HINGED EXPANSION JOINT
This expansion joint has a single bellows section and is designed to allow angular rotation in one plane only. The hinge hardware is rigid in the axial direction so as not to allow the expansion joint to allow axial movement in piping systems. The hinged expansion joint is usually used in pairs of threes or in combination with a gimbal expansion joint.
IN-LINE PRESSURE BALANCED EXPANSION JOINT
This expansion joint is unusual in its’ design in that it absorbs lateral, axial, and angular movement. This in-line pressure balanced expansion joint is designed for cases where the main anchoring is not feasible or pressure loads are to high for equipment like pumps and turbines.