Bailey Technical Catalogue - Safety Systems UK Ltd

616D Safety ValveTECHNICAL SPECIFICATIONApprovalsBS6759 Pt 2PED certified Category IVMaterialsBody - Aluminium (-30 to 200°C)Trim - PTFE/BronzeSize RangeOrifice Min (Barg) Max (Barg)Size mm 2 Pressure PressureDN40 (1 1 ⁄2") 1140 0.2 2.5DN50 (2") 2027 0.2 2.5Kdr (Coefficient of discharge)AirVariableMaximum Back PressureNot applicable on open dischargeConnectionsScrewed In x Open dischargeConstructionTop GuidedCap OptionsDomeSizingRefer to Capacity Charts (page 60-67)DESIGNThe type 616D is a spring operated high capacitysafety valve for low-pressure air applications. It isdesigned to deliver precise relieving and re-seatingpressures while the protected open discharge givesdownward flow. The non-stick seating surfaces givepositive shut-off and freedom from sticking, whilst themixture of aluminium and gunmetal make it light butvery robust. Typically used on blowers or bulktransfer road/rail transport vehicles.It is specially designed to give overpressure protectionof positive displacement air blowers and associatedtanks or pressure vessels.INSTALLATION OF 616DMount the valve in a vertical position wheneverpossible. (It may be mounted at any angle up to 45°without detriment.) Ensure that the valve discharge isunobstructed and does not create a hazard to personsor property.The branch leading to the valve must be the samenominal bore as the valve (or larger) and busheddown at the valve entry. The length must be kept asshort as possible.Due to the adverse effect of pressure pulsations fromthe usual Rootes-type blowers, the valve should notbe mounted within 1.25m of the blower outlet.However, no valve or other obstruction mustintervene between the blower and the safety valve.27