A tank truck has two inlet pipes, each equipped with a flow meter; only one flow meter can be in use at a time
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As the title indicates, a tank truck has two input pipelines; each pipeline is equipped with a flow meter, a feed valve, and a control valve. When the flow rate on each pipeline reaches a set value, the feed valve is shut off automatically. Meanwhile, the flow meter and the control valve work together to form a flow regulation circuit. Now it is also required that only one flow meter can be in operation at a time; how should such interlock be implemented?
Is there enough space to install a bypass pipe?
All that’s needed is to ensure that only one cut-off valve is open and the other is closed at any given time.
What you said isn’t very easy to understand. Do you mean that only one feed line is allowed, and two feed lines cannot be used simultaneously? And there’s also this cut-off valve; you said it should shut down automatically when the flow rate reaches a set value. Do you mean the cumulative flow rate here? Also, this control valve has a closing function, and what is controlled is the flow rate; therefore, it should not form a control loop with a flow meter, but rather a control loop with a flow counter. In other words, does this control valve move gradually from fully open to fully closed? What you’re saying isn’t very precise; science requires a rigorous attitude!
“When the flow rate at each point reaches the set value, the feed valve is shut off via interlock; simultaneously, the flow meter and the control valve form a flow regulation circuit. It is also required that only one flow meter can be in operation at any given time – how should such an interlock be implemented? ” Although I can guess that the first traffic value represents cumulative traffic, your wording is too unprofessional. What does “only one flow meter can operate at a time” mean? Does it mean that the other one is turned off or powered down?
Add a selection module in the middle, or use relaxation control
More information and operational logic are needed to proceed with the design. According to current requirements, when the cumulative supply via Route A reaches its maximum limit, a command is issued to open the valve on Route B. After the valve on Route B is fully opened, Route A is gradually closed. Supply is provided via Route B; when its cumulative value is reached, Route B is shut down. Is it necessary to turn on A at this time? When one supply route experiences an anomaly, does it stop supplying as long as the other route continues to deliver goods? Can this system stop supplying power at any time?