large-double-gimbal-tied-elbow-and-tied-universal

PB Pressure Balanced Expansion Joint

FIT, FORM and FUNCTION

Pressure balanced expansion joints are engineered to absorb axial, lateral, and angular movements while simultaneously maintaining a balanced internal pressure, thereby minimizing the forces transmitted to connected equipment and anchor points. These joints typically feature a combination of bellows and balancing chambers, which work together to counteract the pressure thrust generated during operation. This design is especially valuable in pipeline systems where space constraints or sensitive equipment make it critical to limit external loads.

AS Single Expansion Joint Fit:

Bellows may be attached or linked to piping flanges, pipe, or other typicalindustrial connections.
End connections may conform to standards such as ASME B16.5, ASME B36.10, or customer designed.
Fittings may be the same at each end or different.

AS Form:

Single circular metal bellows, or 1 or more convolutions.
Typical dimensions of ½” ANSI NPS to 240” ID. Overall length may vary,
typically within the range of 6” to 30”.
Bellows may include reinforcement or controlling members
Convolutions may be U shaped or toroidal
Additional accessories may be incorporated such as load bearing
restraints, movement limiters, protection devices.

AS Function:

Absorbs piping (thermal) movement, primarily axial but could include lateral
and angular movements.
Movement amplitude varies, typically within the range of 1/32” to 6”.
Movement frequency may be extreme low cycle (1 per year), or high cyclic
(such as vibration at 60 Hz).

INDUSTRIAL APPLICATIONS

Commonly found in chemical processing, power generation, and petrochemical facilities, pressure balanced expansion joints allow for safe expansion and contraction of piping without compromising system stability. Their advanced engineering ensures reliable performance under fluctuating pressures and temperatures, contributing to both operational safety and the longevity of critical infrastructure.