Specifications:
Stainless steel bolted flange prevents corrosion.
Extra wide membrane opening prevents noise caused by restricted flow.
Internal membrane prevents any water contact with the steel shell, stopping internal corrosion.
Huge choice of products from 2 Litre to 5000 Litre to cover all applications.
All versions supplied with a replaceable membrane meaning the vessel can be serviced without being removed.
Complete with pre-charged valve for topping up air pressure.
Maximum Pressure : 10 Bar
Pre-Set Charge Pressure : 3 Bar
 
Details
Reliance – Aquasystem 8 Litre Potable Expansion Vessel & Sealed System Kit XVES050030
Product: White 8L Vessel
Per-set Pressure (bar): 3
Max Pressure (bar): 10
Height: 200mm
Diameter: 200mm
Connection: 3/4″ MBSP
Code: XVES050030
 
XVES050050 -- Capacity: 18 Litres
Height: 411 mm
Diameter: 270 mm
Max Working Pressure: 8 Bar
Max Working Temperature: 99°C
Max Membrane Temperature: 70°C
Pre Charge: 2.5 Bar
Features: Interchangeable membrane, powder-coated finish, factory tested, galvanized steel flange, welded center seam, 2-year warranty.
 
XVES050060 - 24 Litre
Height: 489mm 
Diameter: 280mm 
Connection: 3/4″ MBSP
 
All Aquasystem expansion vessels are supplied with a replaceable membrane, which separates the water and air, to prevent contamination of the water system, corrosion of the expansion vessel or pressure loss in the water system.
The main purpose of an expansion vessel is to compensate for the increase in volume of water due to the varying water temperatures in hot water or heating systems. When water is heated it expands and as water is not compressible this increased volume will create a rise in pressure within the system. As an example, water being heated from 0°C-100°C will increase by approx 4.5%.
The expansion vessel allows for this extra space, as when water temperature increases the membrane inside the vessel inflates to allow the water to fill the vessel. The membrane will continue to expand until the system reaches its maximum temperature. Once this has been reached the membrane will be fully inflated and takes up the capacity of the vessel shell. Gradually the temperature will drop, which will in turn decrease the volume of water. Due to the pressure from the pressurised air surrounding the membrane, water will start to exit the vessel until the membrane is deflated.