Question regarding cut-off valves
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Pneumatic cut-off valve below the absorption tower: Why doesn’t the cut-off valve close when the air supply valve is turned off? Is it related to the energization and de-energization of the solenoid valve? ?
After the air supply valve is closed, pressure remains inside the valve, so it does not close; it will only close when the air supply pressure drops.
It’s definitely related to the power supply status of the solenoid valve; it won’t close as long as there is no dew point, unless the solenoid valve operates, in which case exhaust will be stopped
It is related to the power on/off of the solenoid valve
It depends on whether it is a gas-shut valve or a gas-open valve, that is, FO or FC
This indicates that the pneumatic valve is double-acting. A double-acting pneumatic valve remains in place when there is no air supply. For a single-acting pneumatic valve, whether it is closed or open when there is no air supply depends on the process requirements.