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Concentric thermostatic mixer valve Mains pressurised thermal store systems (fig.6) *(diagrammatic view – not to scale) *Fig.6 Packages of this type, fitted with a tempering valve (blender valve) can be used. A drop tight pressure reducing valve must be fitted if the supply pressures exceed 5 bar running. Mixer Service valves Hot water An expansion vessel must be fitted, and regularly maintained, to ensure, the unit, is not damaged by excess pressures. This may already be installed externally or internally within the thermal store (check with thermal store manufacturer). Blender valve Expansion vessel Pressure reducing valve Stop tap Return Flow Boiler Cold mains supply *(kits are for illustration purposes only)
