Pressure expansion vessel, 50 l, 10 bar, 3/4"

Product detailed description

Pressure expansion vessels are essential components in closed heating and cooling systems. They accommodate thermal expansion of water or glycol mixtures, preventing excessive pressure build-up in the system. This model is suitable for residential and commercial buildings, including underfloor heating, central heating, and refrigeration systems. Installers typically integrate these vessels into systems where pressure stability is critical for the safe operation of pumps, valves, and heat exchangers.

When sizing and selecting an expansion vessel, it is important to consider the system volume, operating temperature range, and the type of fluid. The vessel must be sized to handle the maximum expected expansion without exceeding the pressure rating of the system components. The 50 l capacity of this model is suitable for medium-sized systems, and the 10 bar pressure rating ensures compatibility with most standard heating and cooling installations.

Technical parameters

The 50 l capacity indicates the volume of fluid that can be accommodated during thermal expansion. The 10 bar pressure rating ensures the vessel can handle typical operating pressures in heating and cooling systems. The 3/4 inch connection size is a standard thread type used in many European plumbing and heating systems, allowing for straightforward integration with existing piping.

Installation and connection

Installation should be carried out in accordance with local regulations and the manufacturer’s guidelines. The vessel should be mounted vertically, with the base supported to prevent movement. The 3/4 inch connection requires a compatible threaded fitting, and a union or compression fitting may be used to facilitate future maintenance or replacement. It is important to ensure the vessel is connected to the system at a point where it can effectively manage expansion without being subject to excessive vibration or mechanical stress.

Common installation mistakes include incorrect orientation, failure to support the vessel properly, and connecting it to a high-pressure section of the system. These can lead to premature wear or failure. Always verify that the vessel is installed in a location that allows for easy access during maintenance and inspection.

Compatibility and accessories

This pressure expansion vessel is compatible with standard heating and cooling systems using water or glycol-based fluids. It is typically used in conjunction with pressure-reducing valves, safety valves, and pressure gauges to monitor and control system pressure. No additional accessories are required for basic operation, but it is recommended to install a pressure gauge for ongoing monitoring of system performance.

Technical background for designers

The vessel operates on the principle of a pre-charged air chamber that compresses as the fluid expands. The SBR membrane separates the air and fluid compartments, ensuring that the system remains sealed and that the pressure is maintained. The membrane is resistant to typical system temperatures and fluid compositions, including up to 50 % antifreeze concentration. The vessel is designed for integration into systems with operating temperatures from -10 °C to +99 °C, with a recommended maximum operating temperature of +80 °C to ensure long-term reliability.

The vertical orientation and base support help to prevent mechanical stress on the vessel body. The CE marking indicates compliance with the EU Pressure Equipment Directive 97/23/EC, ensuring that the vessel meets safety and quality standards for use in European installations.

Service and operation

Regular inspection of the vessel is recommended to ensure it remains in good working condition. Check for signs of corrosion, leakage, or damage to the membrane. The pressure in the air chamber should be checked periodically and adjusted if necessary to maintain the correct pre-charge pressure. No specific service intervals are provided in the brief, but maintenance should be carried out in accordance with the manufacturer’s recommendations and local regulations.

Frequently asked questions

Can the vessel be used with a glycol-based antifreeze solution?
Yes, the vessel is suitable for use with glycol-based antifreeze solutions, provided the concentration does not exceed 50 %.

Is the vessel suitable for outdoor installation?
No, the vessel is designed for indoor use and should be installed in a protected location to avoid exposure to extreme weather conditions.

Can the vessel be installed horizontally?
No, the vessel must be installed vertically with the base supported to ensure proper operation and prevent mechanical stress on the vessel body.

What is the maximum operating temperature for this vessel?
The recommended maximum operating temperature is +80 °C, although the vessel can operate up to +99 °C in certain conditions.