Pressure expansion vessel, 2 l, 8 bar, 3/4"

Product detailed description

Pressure expansion vessels are essential components in closed water systems where thermal expansion must be accommodated. This includes domestic hot and cold water systems, heating circuits and industrial water installations. Installers working in residential, commercial and light industrial settings frequently encounter the need for expansion vessels to prevent pressure surges and system damage. The IVAR AC 2 model is specifically suited for water systems with moderate expansion requirements, where space constraints and standard system pressures are typical design considerations.

When selecting an expansion vessel, the system's operating pressure, temperature range and volume of water must be considered. The vessel must be sized to handle the maximum expected expansion without exceeding its pressure rating. In systems with fluctuating pressure or temperature, the vessel must also maintain its integrity and functionality over time.

Technical parameters

Diameter	130 mm
EAN	8019742078828
Weight	1.05 kg
Code	A012J07
Brand	IVAR

The 2 l capacity and 8 bar pressure rating make this vessel suitable for systems with moderate expansion needs. The 3/4 inch connection size is standard for many water systems, ensuring compatibility with typical pipe sizes. The operating temperature range from -10 °C to +99 °C allows for use in both cold and hot water applications, though the recommended operating temperature is up to +80 °C for optimal performance.

Installation and connection

The vessel is installed in the water system using a 3/4 inch threaded connection. It should be mounted vertically and secured with appropriate wall brackets to prevent movement. The connection point should be located near the main water supply or heating system to effectively manage expansion. During installation, the system must be depressurised and isolated before connecting the vessel. A pressure gauge and bleed valve should be installed to monitor and adjust the pre-charge pressure. Common installation errors include incorrect orientation, failure to secure the vessel and neglecting to adjust the pre-charge pressure to match the system's minimum operating pressure.

Compatibility and accessories

This vessel is compatible with potable water systems and heating circuits operating within the specified pressure and temperature ranges. It is typically used in conjunction with pressure-reducing valves, pressure gauges and safety valves to ensure system stability. No additional components are included in the standard delivery, so a pressure-reducing valve may be required for systems with fluctuating pressure. Related products may include expansion vessels of different capacities and pressure ratings for larger systems.

Technical background for designers

The vessel operates on the principle of separating the water and air compartments using an EPDM membrane. As the water expands due to heating, the membrane compresses the air chamber, accommodating the increased volume without raising the system pressure. The EPDM material is resistant to ozone and weathering, making it suitable for long-term use in water systems. The vessel is designed to integrate into closed-loop systems, where it helps to maintain stable pressure and prevent damage from thermal expansion. The service life and efficiency depend on the correct pre-charge pressure, regular maintenance and the quality of the system's other components.

Service and operation

The vessel requires periodic inspection to ensure the pre-charge pressure remains within the recommended range. The pressure should be checked using a pressure gauge and adjusted if necessary. The EPDM membrane should be inspected for signs of wear or damage, and the vessel should be drained and flushed if necessary. No specific service intervals are provided in the brief, but regular checks are recommended to maintain system performance.

Frequently asked questions

Can the vessel be used in a heating system with a 10 l pipe volume?
Yes, the 2 l capacity is sufficient for a heating system with a 10 l pipe volume.

Is a pressure-reducing valve required for installation?
A pressure-reducing valve is not included in the delivery but may be necessary for systems with fluctuating pressure.

Can the vessel be installed horizontally?
No, the vessel should be mounted vertically as specified in the installation instructions.

Is the EPDM membrane suitable for potable water?
Yes, the EPDM membrane is suitable for use in potable water systems.