Project Description

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. Futhermore, this helps with vibration, absorb small pipe movements. And to provide flexibility during installation. In addition to, 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 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 the pressure thrust or compression for vacuum conditions. Limit rods with flow liners help with the most difficult applications. Standard configurations are available from inventory. Consult the factory for non-standard designs involving special materials or design conditions.


Bellows pump connectors are designed to connect piping to mechanical equipment that has thermal growth or mechanical movement. Limit rods are an necessary part of the design to prevent over extension or compression. Therefore, install the rods lose for full benefit. The rigid anchor must be capable of reacting the pressure thrust and the spring force of the bellows. Bellow pump connectors are a type of metal expansion joints.

Flow Liners

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


In this paragraph, I am going to talk about some of the EJMA has guidelines for bellows pump connectors and flow liners. Firstly flow liners are recommended for gas flow. Secondly liners are recommended for liquid flow. Next liners are designed for unidirectional flow, and flow conditions normally experienced in industrial and HVAC applications. Finally, for conditions involving bi-directional flow, high velocities, abrasive materials or extreme turbulence, consult the factory.