Pressure regulation control method
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Could an expert please describe the control mechanism for this type of pressure regulation? Medium: nitrogen; purpose: nitrogen purging for fuel and hazardous chemicals storage in tanks.
It’s likely a staged process, with the opening degree of the two valves controlled based on pressure
The pipeline between PV-11011A and PV-11011B can be regarded as a pressure vessel; it is a pressure split control system. Control the flow rate entering the pipe and the flow rate exiting the pipe, thereby achieving control over the pipe pressure.
What is its function? Is it not necessary to control the pressure behind valve PV-11011B? This is a main pipe, with pressure regulation at the back; it has the same design
What is the main purpose of segmented control?
Based on the diagram you provided, there is no pressure monitoring and control shown behind PV-11011B.
The pipeline between PV-11011A and PV-11011B can be regarded as a pressure vessel; it is a pressure split control system. Control the flow rate entering the pipe and the flow rate exiting the pipe, thereby achieving control over the pipe pressure.
One for supplementary pressure, one for overpressure relief
One intake valve assembly, one exhaust valve assembly
PV-11011A is the nitrogen supply valve, while PV11011B is the exhaust valve; control is achieved through stepwise operation. For example, when the desired pressure is 50 aKpa, if the pressure is below 45 aKpa, PV-11011A is activated to supply nitrogen, and if the pressure exceeds 55 aKpa, PV11011B is activated to exhaust air. The specific principle is shown in the figure