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Solar Expansion Vessels

An expansion vessel must ensure the solar system can work safely, particularly during periods when hot water is not being drawn off. During this period modern solar collectors may reach temperatures up to 200°C and consequently the fluid within the system can either evaporate or reach levels that can damage all the components within the solar energy system over time.

In order to resist the highest possible stagnation temperatures, a special heat-resistant diaphragm has been developed that can withstand up to 130°C. In the event that the diaphragm within the expansion vessel could be subjected to temperatures above 130°C, the vessel must be protected by an additional vessel (VDI 6002 directive).

All solar expansion vessels are suitable for installation in solar systems complying with DIN 4757 and EN 12977 and are suitable for use with a mixture of water and propylene or ethylene glycol. The expansion vessels are tested according to the Pressure Systems Directive. The diaphragm within the expansion vessel ensures that the system pressure does not exceed or go below the limits specified. The diaphragm separates the space inside the vessel occupied by the gas and by the solar liquid. The initial pressure of the gas side must be regulated before turning on the system. The diaphragm allows the liquid to expand into the gas chamber when the volume of the solar liquid expands due to the raise in temperature, maintaining the pressure inside the solar system at the approved maximum value. When the temperature of the solar liquid cools, the volume decreases, the diaphragm returns to its initial position and the pressure remains constant at the approved minimum value.

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Solar Expansion Vessels. An expansion vessel must ensure the solar system can work safely, particularly during periods when hot water is not being drawn off. During this period modern solar collectors may reach temperatures up to 200°C and consequently the fluid within the system can either evaporate or reach levels that can damage all the components within the solar energy system over time. In order to resist the highest possible stagnation temperatures, a special heat-resistant diaphragm has been developed that can withstand up to 130°C. In the event that the diaphragm within the expansion vessel could be subjected to temperatures above 130°C, the vessel must be protected by an additional vessel (VDI 6002 directive). All solar expansion vessels are suitable for installation in solar systems complying with DIN 4757 and EN 12977 and are suitable for use with a mixture of water and propylene or ethylene glycol. The expansion vessels are tested according to the Pressure Systems Directive. The diaphragm within the expansion vessel ensures that the system pressure does not exceed or go below the limits specified. The diaphragm separates the space inside the vessel occupied by the gas and by the solar liquid. The initial pressure of the gas side must be regulated before turning on the system. The diaphragm allows the liquid to expand into the gas chamber when the volume of the solar liquid expands due to the raise in temperature, maintaining the pressure inside the solar system at the approved maximum value. When the temperature of the solar liquid cools, the volume decreases, the diaphragm returns to its initial position and the pressure remains constant at the approved minimum value.

Starting at: £4.75