Multifunctional pressure expansion vessel - 100l; 10bar; 5/4" IVAR.DPV 100 - MULTIFUNCTIONAL

Product detailed description

Pressure expansion vessels are essential components in closed heating and hot water systems to accommodate thermal expansion safely. In residential, commercial and industrial buildings, they help maintain stable pressure within the system and prevent damage caused by pressure fluctuations. This model is commonly used in central heating systems, solar thermal loops and DHW circuits where accurate pressure control is required. Proper installation ensures long-term performance and compliance with safety standards.

For installers, selecting the correct expansion vessel involves matching the system volume, maximum operating temperature and pressure. The vessel must be positioned close to the boiler or heat source and integrated into the system piping according to local regulations. Ensuring the correct orientation and secure mounting is critical to avoid mechanical stress on the vessel body and internal components.

Technical parameters

Installation and connection

Installation requires positioning the vessel in a location accessible for inspection and maintenance. The 5/4" connection size should be matched to the corresponding pipe diameter using appropriate fittings. A stainless steel inlet with hexagonal head facilitates secure tightening with standard tools. Check that the vessel is mounted vertically or horizontally depending on the model variant (DP for hanging, DPV for vertical with base). Avoid over-tightening connections to prevent leakage. Common mistakes include incorrect orientation, which can lead to uneven pressure distribution, or failure to bleed air from the system before commissioning.

Compatibility and accessories

This expansion vessel is compatible with a wide range of heating systems using water as the heat transfer medium. It should be paired with a pressure relief valve and a pressure gauge to monitor system conditions. For complete system integration, additional accessories such as non-return valves and isolation valves may be required. Ensure all components meet the same working pressure and temperature ratings to maintain system integrity.

Technical background for designers

The vessel operates based on the principle of separating the air and water chambers via a fixed butyl membrane. This design prevents direct contact between the gas and water, reducing corrosion risk and extending service life. The butyl material provides flexibility under thermal cycling and is resistant to degradation from water additives and pH variations. The stainless steel inlet ensures durability and leak-free performance. Integration into the system depends on proper sizing relative to the total system volume and expected temperature rise. Long-term efficiency is influenced by regular inspection of the membrane condition and absence of air leaks.

Service and operation

Periodic visual inspections are recommended to detect signs of wear, corrosion or pressure loss. Verify that the pressure gauge reads within the expected range and that the membrane remains intact. If the vessel shows signs of reduced effectiveness—such as frequent pressure adjustments or unusual noises—it may require servicing. While no scheduled service intervals are specified, any operational anomalies should be addressed immediately to prevent system disruption.

Frequently asked questions

Can the IVAR A2C2L38 be used in solar water heating systems?
Yes, provided the system operates within the recommended temperature and pressure limits. The butyl membrane is suitable for the water quality typically found in such systems.
Is the butyl membrane replaceable?
The membrane is fixed and not designed for replacement. In case of failure, the entire unit should be replaced.
What is the difference between DP and DPV variants?
DP is intended for wall mounting with suspension brackets, while DPV is a vertical model with a base plate for floor mounting.
Can this vessel be used in systems with glycol-based heat transfer fluids?
No, the vessel is specifically designed for water-based systems. Glycol compatibility is not confirmed by the manufacturer.