Self-operated regulating valve and pressure control valve
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Dear friends, after using a self-operated regulating valve to depressurize high-pressure nitrogen to medium-pressure nitrogen, why do we need a pressure control valve as shown in the picture? Can anyone please explain?
I think the reason is as follows~~Welcome to make a comment: The design pressure of the medium-pressure nitrogen tank is less than the operating pressure of high-pressure nitrogen. This is a major premise~~~IF self-operated valve PCV80021 fails. In order to ensure the continuity of the system, the PCV80021 double-line valve must be opened~~~In this way, PV80020 is put into pressure reduction work~~~~ so, PV80020 functions: Security (Or~OCV80021's backup)
This design should be to save costs. If the self-operated valve in front is not used and the regulating valve is used directly, the selection of regulating valves will be too demanding and the cost will be too high. Add a self-operated pressure reducing valve to reduce the pressure and adjust the cost of the valve * * reduce. I don’t know if this is the reason
PCV is to divide the voltage drop of PV