Expansion Vessels for Solar Water Heating Systems
The solar circulation system operates in a similar way the central heating system in your home, the system has a pressure gauge, fill loop and expansion vessel.
Opening a valve called a fill loop pressurizes the system. The fill loop uses the mains pressure water to create the pressure in the system.
Normally mains pressure is between 2.5 and 3.5 bar, the correct pressure in our system is 1.0 - 1.5 bar and this is viewed in the 6 bar pressure gauge.
In order to prevent fluctuations in the pressurised system due to heat expansion we fit an expansion vessel which absorbs any expansion or contraction in the fluid in the system.
The system is fitted with a 6 bar PRV (pressure relief valve) which is fitted in the pipe work on the roof.
In the unlikely event of the system overheating and the expansion vessel being unable to absorb any further expansion, pressure will be released by the PRV on the roof away from harm.
We size our expansion vessels to be able to contain any possible extreme temperature in the system.
