Expansion Vessels

Stable system expansion, protected performance

Expansion vessels accommodate changes in water volume within sealed heating and chilled water systems. By managing thermal expansion and maintaining consistent pressure, our solutions help protect components, reduce equipment wear and support efficient, reliable system performance with long-term stability.

Why work with Pump Action

Improved Efficiency

Our approach ensures your systems operate at optimal performance, reducing energy usage and lowering operational costs over time.

Knowledge and Support

With specialised expertise in fluid systems, we provide informed, practical solutions tailored to your environment and requirements.

Long-term reliability

We focus on delivering solutions that perform consistently and extend equipment lifespan.

Reduced Downtime

Our experienced engineers deliver precise installation and full system commissioning ensuring optimal performance from day one.

Our manufacturers

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FAQs

What is an expansion vessel and what does it do?

An expansion vessel is designed to absorb the increase in water volume caused by temperature changes within sealed systems. It helps maintain stable pressure and prevents excessive strain on system components.

Where are expansion vessels typically used?

Expansion vessels are commonly used in heating and chilled water systems across commercial buildings, residential developments, healthcare facilities and industrial applications.

How do you size an expansion vessel correctly?

Correct sizing depends on factors such as system volume, operating temperature, and pressure requirements. Selecting the right size ensures the vessel can effectively absorb expansion, maintain system stability and prevent unnecessary wear or pressure issues.

What are the signs of a faulty expansion vessel?

Common signs include fluctuating system pressure, frequent need for system top-ups, water discharge from safety valves, or unusual noises within the system. Identifying these early can help prevent further damage and maintain efficient operation.