In the refined oil loading system, should the pump be started first and then the valve, or should the valve be opened first and then the pump? What about when shutting it down?
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There is a project for a refined oil transfer center, which includes the loading process. The loading pump and electro-hydraulic valves are controlled by a batch controller; when starting up, should the valve be opened first or the pump? When shutting down, should the pump be turned off first or the valve? Which method can achieve more precise flow control? Please share some suggestions; thanks in advance
Start the pump first and then the valve; when shutting down, close the valve first and delay shutting down the pump
What are the benefits? Give me a reason. Can’t we open the valve first and then the pump when starting it?
I think the valve should be opened first and then the pump, while to shut them down, the pump should be turned off first and then the valve
I agree with the 4L version; that electro-hydraulic valve is itself two-stage in design
The form of the pump matters; it’s best to consult a specialist in mechanical pumps
When starting, the valve must be opened first and then the pump; when stopping, the pump must be turned off first and then the valve
It depends on the type of pump; if it is a screw pump, the valve must be opened first before starting the pump； Stop the pump first, then close the valve ； If it is a centrifugal pump, start the pump first, then open the valve ； Close the valve first, then stop the pump ； It’s best to ask about the requirements specific to mechanical equipment and the manufacturing processes ；
Agree with what was said above; different pumps have different usage requirements, and using the wrong one can cause damage
The valve has been decided; it’s a electro-hydraulic valve. What was said on the 5th floor is correct – it’s a 2-stage type. The pump has not been finalized yet, but it should be a centrifugal pump. Is determining this sequence mainly based on the pump? Is it related to the valve a lot?
It is recommended that, regardless of the type of pump, it’s best to open the valve first; you need to take your rubber hoses into consideration