Steam is used to sanitize a vessel, and the vessel is having the following safety equipments , Pressure vacuum vent valve , Vacuum vent valve . Pressure vaccum vent valve set @100 mbar and the vacuum vent valve set@120 mbar . The VVV is interlocked to the control panel and opening of VVV disturbs the entire system. The Utility flow rate has to be designed in a such a manner that the Vacuum vent valve is never opened while cooling.