Pressure expansion vessel, 35 l, 10 bar, 3/4"

Product detailed description

Pressure expansion vessels are essential components in closed heating and cooling systems, particularly in residential and commercial buildings. They accommodate thermal expansion of the system fluid, preventing excessive pressure build-up that could damage system components. This IVAR model is suitable for use in multi-storey buildings, single-family homes, and industrial facilities where reliable pressure management is required. Installers typically encounter this equipment in central heating systems, underfloor heating circuits, and solar thermal installations.

Correct sizing and installation of the expansion vessel are critical to system performance. The vessel must be selected based on system volume, operating pressure, and temperature range. This model is designed for use in systems with a maximum operating pressure of 10 bar and a temperature range from -10°C to +99°C, with a recommended operating temperature limit of +80°C. The vessel is constructed with an SBR membrane to separate the air and fluid chambers, ensuring long-term stability and preventing contamination.

Technical parameters

The 35 l capacity of this vessel is suitable for systems with moderate expansion requirements. The 10 bar pressure rating ensures compatibility with standard heating and cooling systems. The 3/4 inch connection allows for secure integration into most piping systems. The maximum diameter of 400 mm and height of 390 mm should be considered during installation to ensure sufficient space in the mechanical room or equipment area.

Installation and connection

Installation should be carried out in accordance with local plumbing and heating regulations. The vessel should be mounted vertically with a stable base to prevent movement. The 3/4 inch inlet connection requires a compatible pipe fitting, typically a threaded connection. The vessel should be installed close to the boiler or heat source to ensure effective pressure management. Before commissioning, the pre-charge pressure should be checked and adjusted to match the system's cold pressure. Common installation errors include incorrect orientation, insufficient space for maintenance, and failure to check the pre-charge pressure.

Compatibility and accessories

This pressure expansion vessel is compatible with standard heating and cooling systems using water or glycol-based mixtures with up to 50% concentration. It is typically used in conjunction with pressure-reducing valves, safety valves, and pressure gauges to form a complete pressure management system. No additional accessories are required for basic installation, but system designers may choose to include a pressure relief valve for added safety.

Technical background for designers

The operating principle of this vessel is based on the separation of the system fluid and compressed air by an SBR membrane. As the fluid expands due to heating, the membrane moves, allowing the vessel to absorb the excess volume. The SBR material is resistant to temperature fluctuations and compatible with glycol mixtures, making it suitable for a wide range of applications. The vessel is designed to comply with the EU Pressure Equipment Directive 97/23/EC and is CE marked. The service life and efficiency of the vessel depend on correct pre-charge pressure, system temperature, and the quality of the installation.

Service and operation

Regular maintenance is not required for this model unless there is a noticeable drop in system pressure or signs of leakage. The pre-charge pressure should be checked periodically and adjusted if necessary. The vessel should be inspected for signs of corrosion, membrane wear, or connection leaks. No specific service intervals are provided in the technical documentation.

Frequently asked questions

Can this vessel be used in a system with 4 radiators and a 14 l heat exchanger?
Yes, the 35 l capacity is sufficient for a system with 4 radiators and a 14 l heat exchanger.

Is this vessel suitable for a three-storey building with potential pressure issues?
Yes, the 10 bar pressure rating and 35 l capacity make it suitable for multi-storey buildings. However, if pressure issues persist, a circulation pump may be necessary.

Can this vessel be used with a glycol mixture?
Yes, it is compatible with glycol mixtures up to 50% concentration.

What is the recommended operating temperature range?
The recommended operating temperature is up to +80°C, although the vessel can function in systems with temperatures up to +99°C.