The control valve for feeding raw materials into the device should be selected as
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Should a gas-operated shut-off valve be used for the control valve of raw material feed into the device? Why
It is necessary to ensure that crude oil flows into the unit in case of an accident.
The air valve shuts off when the air supply is stopped or when the air pressure drops, which leads to an emergency shutdown due to a disruption in the supply of raw materials; however, a short-term interruption in the air supply or a drop in air pressure does not necessarily require the cessation of material feeding. From a safety perspective, in catalytic cracking, aside from the need to use air-operated open valves in the stabilization and absorption systems, air-operated closed valves are generally preferred for other systems.
This needs to be determined based on specific process requirements and safety requirements.