How to prevent valve failure in data centre compressor cooling systems
Data centre cooling systems are under increasing pressure to support higher computing densities, greater thermal loads and the transition to lower Global Warming Potential (GWP) refrigerants. As a result, oil-free compressors are becoming an increasingly important part of modern cooling infrastructure because they can deliver the high lift capability required by demanding applications while supporting refrigerant transition strategies.
However, the compressors themselves create a challenging operating environment for the components used within their cooling circuits. Sustained temperatures, high differential pressures and refrigerant compatibility requirements can all contribute to premature valve failure if components are selected using catalogue specifications alone rather than application-specific operating conditions. For OEMs developing compressor cooling systems for data centre applications, understanding these design considerations early can help improve reliability, reduce maintenance requirements and avoid unnecessary redesigns later in the development cycle.
What is compressor active cooling?
Compressor active cooling uses a refrigerant-based cooling cycle to remove heat from critical compressor and cooling-system components. In data centre applications, it helps maintain stable operating temperatures where increasing heat loads cannot be managed through ambient cooling alone. It becomes particularly important in data centres where increasing rack densities and AI workloads place greater demands on thermal management.
Oil-free compressors are often selected for these applications because they can support high lift operation while avoiding some of the compatibility challenges associated with lubricated systems and newer refrigerants.
Why do valves fail in compressor cooling applications?
Valve reliability is often affected by three interacting factors rather than a single operating condition.
Sustained operating temperatures: High-lift compressor operation can expose valves, operators and seals to elevated temperatures for extended periods. Over time, this can accelerate seal degradation, affect material properties and reduce component life.
High differential pressure: Many compressor cooling applications require compact valves to operate under high differential-pressure conditions while maintaining stable performance and flow control in elevated-temperature environments. Pressure differential, temperature and flow demands all influence long-term valve durability.
Refrigerant compatibility: As cooling systems transition toward lower-GWP refrigerants, seal and wetted material compatibility becomes increasingly important. Materials that perform well with one refrigerant may not offer the same durability when exposed to newer refrigerant types or different operating temperatures.
The challenge is rarely one of these factors in isolation. More commonly, it is the combination of heat, pressure and refrigerant chemistry acting together over millions of operating cycles that determines valve life.
The engineering challenge: improving reliability without increasing compressor size
In one compressor cooling application, the challenge was not controlling the main refrigerant supply to the data centre. Instead, the valves formed part of an internal component-cooling circuit within an oil-free compressor, helping regulate flow to temperature-sensitive areas including the motor cavity and power electronics.
These cooling circuits play an important role in maintaining stable operating temperatures for critical compressor components. As thermal loads increase, the cooling system must manage heat effectively without increasing compressor size or compromising reliability.
The compressor manufacturer needed a valve solution capable of delivering four requirements simultaneously:
high-lift capability within an oil-free compressor architecture
compatibility with lower-GWP refrigerant environments
improved resistance to elevated operating temperatures
compact integration within a constrained compressor envelope
In many cases, simply selecting a larger valve is not practical because compressor packaging constraints leave little available installation space. The solution must therefore balance performance, reliability and footprint simultaneously.
The role of integrated valve designs
One approach increasingly used in compressor cooling applications is direct integration of control valves into the compressor housing.
Integrated designs help reduce overall system footprint while simplifying installation and supporting more efficient layouts. Because the valve arrangement becomes part of the compressor architecture, engineers have greater flexibility to optimise space utilisation and thermal management.
In this application, the cooling circuit required two compact two-way valves to manage flow to separate cooling zones within the compressor. This made valve size, mounting arrangement and integration into the existing manifold particularly important.
Rather than redesigning the surrounding manifold, the engineering team adapted the valve interface to fit the available installation space and existing packaging envelope. The valve body and sealing system were then configured around the application's thermal, pressure and media requirements. For demanding cooling applications, the design process may include:
validating materials against the intended refrigerant environment
assessing temperature exposure at the valve's actual mounting location
reviewing pressure differential and flow requirements
considering how thermal energy is dissipated around the valve assembly
ensuring compatibility with existing compressor architectures where required
Taking this broader systems approach often produces a more robust result than evaluating pressure rating, flow capacity or material compatibility independently.
Depending on the application, compatibility assessment may need to cover both established HFC refrigerants and newer lower-GWP HFO or HFO-blend alternatives. Compatibility should always be confirmed against the specific seal material, temperature range and duty cycle.
Prototype testing may include thermal cycling and high-pressure validation under application-relevant conditions. This provides evidence that selected sealing materials, valve geometry and mounting arrangements can tolerate the combined thermal and pressure demands expected in service.
What should engineers specify when selecting compressor cooling valves?
Before selecting a valve, it is useful to define:
refrigerant type and future refrigerant transition plans
maximum pressure differential
required flow rates
operating and peak temperatures
expected duty cycle
target service life
space and mounting constraints
seal and wetted material requirements
compatibility with legacy designs where applicable
Defining these parameters early helps avoid specification changes later in the project and allows potential design risks to be identified sooner.
Why early engineering collaboration matters
Compressor cooling applications rarely fit neatly into standard product specifications.
Early collaboration between compressor manufacturers and valve engineers allows temperature, pressure, material compatibility and packaging constraints to be reviewed together. This can accelerate design iterations and help ensure the final solution aligns with the requirements of the complete cooling system rather than a single component.
Supporting next-generation data centre cooling
As data centre cooling systems continue to evolve, compressor designers must balance increasingly demanding thermal requirements with sustainability goals and changing refrigerant technologies.
Valve selection plays an important role in that process. Components designed specifically for high-lift compressor applications can help engineers address temperature, pressure and material compatibility challenges while maintaining compact system layouts and long-term operational reliability.
Talk to us about compressor active cooling applications
We work with compressor and cooling system manufacturers to develop integrated fluid control solutions for demanding cooling environments, helping engineering teams address pressure, temperature, refrigerant compatibility and packaging requirements during the design process.
Explore our data centre cooling capabilities or speak to one of our engineers about your next cooling system design.