When the calibrated pressure is reached, the valve opens and, by means of the discharge to atmosphere, prevents the pressure of the system from reaching levels which would be dangerous for the boiler and the components in the system itself.
The Altecnic SRV series 311 through 314, 513 and 514 safety (pressure relief) valves are made by Caleffi S.p.A. in compliance with the essential safety requirements laid down by Directive 97/23/CE of the European Parliament and the Council of the European Union for harmonisation of member states with regard to pressurised equipment.
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The Water Regulations Advisory Scheme (WRAS) Approval demonstrates that a particular product is compliant with Water Supply (Water Fittings) Regulations or Scottish Byelaws.
With the proliferation of storing water at high water temperatures i.e. above 60°C or having a storage vessel capable of storing hot water at a temperature exceeding 80°C valves capable of reducing the water supply temperature to a more acceptable distribution temperature must be fitted adjacent to the hot water storage vessel.
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