Pump interlock
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There are currently two pumps and one control valve. The two pumps are interlocked; if neither of them can operate, the valve will be shut down as a result of this interlock. However, considering that it’s possible for both pumps to not be running at the moment of interlocking, which could also trigger the interlock, how can this issue be resolved?
This post was last edited by ylb913 on 2016-8-24 at 19:21 to remove the chain or bypass this condition. Many chains do not state that investments are made right from the start; instead, they are made only after operations have stabilized.
You can add a delay: if there is no signal from either pump, the valve will be closed after a certain period of time has passed!
Your question shouldn’t really be a problem! Firstly, pump interlocking can be handled through relay contacts in the electrical control circuit, while the interlocking between the pump and the valve can be addressed by using instruments for configuration (based on their relationship). Very simple logical interlocking
Either add a delay or create a bypass switch