Bellow Pump Connector

In this article, I am going to tell you about bellow pump connectors and flow liners. Mechanical equipment usually needs a pump connector. Furthermore, this helps with vibration, absorbs small pipe movements. And to provide flexibility during installation.

In addition, for help with flexibility and fatigue resistance, use bellows. Additionally, standard configurations include limit rods to react to the pressure thrust or compression for vacuum conditions. Finally, bellows pump connectors are installed on the pump to absorb motion.

    • Sizes 1-1/2” through 24.”
    • Design Conditions: full vacuum to 150 and 300 PSIG at 500°F
    • Compact design with maximum flexibility and extended life

Standard configurations include limit rods to react to the pressure thrust or compression for vacuum conditions. Limit rods with flow liners help with the most challenging applications.

Standard formats are available from inventory. Consult the factory for non-standard designs involving unique materials or design conditions.


Bellows pump connectors connect piping to mechanical equipment that has thermal growth or mechanical movement. Limit rods are a necessary part of the design to prevent over-extension or compression. Therefore, install the rods lose for full benefit.

The rigid anchor must react to the pressure thrust and the spring force of the bellows. Bellow pump connectors are a type of metal expansion joint.

Flow Liners

Flow liners or internal sleeves are optional features on standard Bellows Pump Connectors. Inner sleeves have several purposes. Firstly is to minimize pressure loss. Next is to prevent bellows resonance in a turbulent flow. Also, prevent erosion of the bellows. Furthermore, to prevent direct impingement of high-temperature flow on the bellows.


This paragraph will discuss some of the EJMA guidelines for bellows pump connectors and flow liners. Firstly we recommend flow liners for gas flow. Secondly, liners are recommended for liquid flow. Next, flow liners for unidirectional flow and flow conditions are typically experienced in industrial and HVAC applications. Finally, for situations involving bi-directional flow, high velocities, abrasive materials, or extreme turbulence, consult the factory.