Pressure control valve (PCV), pressure relief valve (PRV), etc. Superimposed backpressure is the result of pressure in the discharge system coming from other sources i.e. Superimposed backpressure is the static pressure that exists at the outlet of a pressure relief device (PRD) at the time the device is required to operate ('Ready-to-operate' mode). It is important to make the defintion clear prior to any discussion. In many event, understanding of this 'backpressure' creates a lot of confusion among engineers in operation, design, vendor, manufacturer, etc.
' Relieving' mode is PRV disc away from seat allowing fluid passing the PRV valve nozzle when the inlet pressure (Pi) is higher than PRV set pressure (Ps).Īs PRV may be in Ready-to-operate and Relieving mode, the 'backpressure' exist at different modes will vary. ' Ready-to-operate' mode is the PRV's disc keeping PRV in closed position when inlet pressure (Pi) is lower than or equal to PRV set pressure (Ps). A pressure relief valve (PRV) in ' Ready-to-operate' mode and ' relieving' mode during plant operation will expose to different type of pressure.
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