Durgo Safety Valve, or Pressure Relief Valve, type SV65 (4165) operates progressively and can be used in pressurised systems with cold and hot water, air, oils and other media. The valve housing, nipple and cone are in non-corrosive stainless steel with seal material of fluorinated rubber (FPM/FKM) or EPDM. Durgo Safety Valves are Class 4 categorized and CE labelled in accordance with the Pressure Equipment Directive (PED 2014/68/EU).