How does a safety valve provide self-protection on instruments?
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For catalytic self-protecting valves, they will activate when the reaction temperature is low and the feed rate is low. Does the safety valve receive temperature and flow signals, or does it receive a command to operate the valve?
It is when the reaction temperature is low and the feed rate is low that the control system sends a signal to the safety valve. This signal can be a digital signal, the solenoid valve associated with the control valve ； It can also be the opening degree of an analog control valve; in any case, what’s required is for the valve to reach a specified position.