Pressure expansion vessel, 18 l, 8 bar, 3/4"

Product detailed description

Pressure expansion vessels are essential components in closed heating and cooling systems to accommodate thermal expansion of the fluid. This IVAR model is commonly used in residential and commercial buildings, including underfloor heating, radiators, and heat pump systems. Installers must ensure correct sizing and positioning to maintain system pressure stability and prevent damage from overpressure. The vessel is designed for integration into systems with fluctuating temperatures and fluid volumes.

When installing, the vessel should be mounted in a location that allows for easy access for inspection and maintenance. It should be connected to the system via a 3/4 inch threaded port and positioned in a way that minimises stress on the piping. The vessel is not intended for use with open systems or systems containing aggressive media. It is suitable for systems operating between -10 °C and +99 °C, with a recommended maximum operating temperature of +80 °C.

Technical parameters

Installation and connection

Installation should be carried out in accordance with the manufacturer's instructions and local regulations. The vessel is connected via a 3/4 inch threaded port, typically using a compression or soldered fitting. It is important to ensure that the vessel is installed in a vertical position and that the connection is secure to prevent leaks. A pressure gauge and safety valve should be installed upstream of the vessel to monitor system pressure and provide overpressure protection. Common installation errors include incorrect orientation, failure to check the pre-charge pressure, and neglecting to isolate the vessel for maintenance.

Compatibility and accessories

This pressure expansion vessel is compatible with closed heating and cooling systems operating within the specified temperature range. It is designed to work with non-freezing mixtures containing up to 50 % concentration. For complete system protection, it should be used in conjunction with a safety valve and pressure gauge. No additional accessories are required for standard installations. No related products are available for this model.

Technical background for designers

The vessel operates on the principle of separating the expansion space from the system fluid using an SBR membrane. The membrane is flexible and allows the vessel to accommodate changes in fluid volume without allowing the fluid to come into direct contact with the vessel's internal structure. The SBR material is resistant to common heating fluids and provides a long service life when used within the recommended temperature and pressure limits. The vessel is designed to be mounted vertically and should be integrated into the system in a location that minimises thermal stress and vibration. The maximum concentration of non-freezing mixture is limited to 50 % to prevent degradation of the membrane and internal components.

Service and operation

Periodic inspection is recommended to ensure the vessel is functioning correctly. The pre-charge pressure should be checked and adjusted if necessary. The vessel should be isolated from the system before any maintenance work is carried out. No specific service intervals are provided in the technical data. The vessel should be replaced if the membrane is damaged or if the vessel fails to maintain pressure. The CE marking confirms compliance with the EU Pressure Equipment Directive 97/23/EC.

Frequently asked questions

Can the IVAR A102L24 be used with glycol-based mixtures?
Yes, the vessel is compatible with non-freezing mixtures containing up to 50 % concentration. Exceeding this limit may affect the membrane and internal components.

What is the maximum operating temperature for this vessel?
The recommended maximum operating temperature is +80 °C, although the vessel is rated for use up to +99 °C.

Is the vessel suitable for use in open systems?
No, the vessel is designed for closed heating and cooling systems only. It is not intended for use with open systems.

What type of connection does the vessel use?
The vessel uses a 3/4 inch threaded connection for integration into the system.