PBMC couplings

High-flow blind‑mate connections for data centers

As data center processors generate increasingly higher heat loads, liquid cooling systems must deliver greater flow capacity to maintain stable thermal performance. Existing blind-mate couplings often fall short – either limiting flow or relying on rear-end movement that complicates installation and creates alignment issues for system builders.

The Pivoting Blind Mate Coupling (PBMC) solves these challenges by providing high flow performance within a fixed-installation design, eliminating unwanted backend motion while maintaining the angular and radial flexibility required for reliable blind-mate engagement. Its advanced self-centring capability ensures precise alignment during connection, even under pressure, reducing system complexity by removing the need for additional alignment mechanisms. The result is a robust and installer-friendly solution that meets modern cooling demands while ensuring reliable operation and serviceability.

• High flow performance

  The PBMC is designed to deliver the higher flow rates needed 
  for modern liquid cooling systems, ensuring effective heat removal even under heavy workloads.
  
  

• Trusted blind‑mate functionality

  A high tolerance for angular and radial misalignment enables smooth, repeatable blind‑mate connections in tight or complex server and manifold configurations.
  
  

• Fixed‑installation stability

  With a stationary backend design, the PBMC eliminates unwanted rear‑end motion – reducing mechanical complexity and simplifying installation.

• Self‑centering functionality – even during pressure

  The PBMC’s self‑aligning interface automatically guides the coupling into the correct position, maintaining precise alignment and secure engagement even under pressure.
  
  

• Double O‑ring seal for redundancy and extra leak protection

  A dual‑seal configuration provides an additional layer of protection, enhancing leak resistance and maintaining sealing integrity throughout continuous operation.

Fixed-installation design for flexible hose or tube integration

The PBMC features a fixed‑installation design to address challenges posed by moving parts, isolating the plug’s hose connection from the pivoting alignment body. By separating these components, the pivoting body can move freely regardless of hose material, stiffness, or routing, giving developers greater freedom to choose the hose or tubing that best fits their system design. This results in easier server integration and more flexible routing, while maintaining a consistent, reliable connection.

CEJN – Open Compute Project (OCP) Solution Provider

CEJN is an active contributor to the Open Compute Project (OCP) and participates directly in the development of OCP liquid cooling coupling standards. Our quick couplings are designed to meet these standards, ensuring full compatibility, safety, and optimal performance. All CEJN OCP solutions are developed and produced in-house, giving full control over quality, reliability, and delivery.

UQD / UQDB – Contributed with testing and collaboration with other manufacturers.

BMQC – Supported development and testing to ensure reliable, fully compatible couplings.

LQC – Co-developing the standard initiated by Meta, contributing with design, testing and production.

PBMC – Supported development and testing to ensure reliable, fully compatible couplings.

Full-range provider of hoses and couplings for liquid cooling applications

CEJN provides various hose and coupling solutions for liquid cooling applications such as Direct Liquid Cooling (DLC), Cooland Distribution Units (CDU), and immersion cooling. We offer products that are tested and validated to ensure quality and reliability, and our careful review process confirms that every component is compatible and delivers reliable performance within the system.