Piping design (control valves, pumps)
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Hello, marine friends: There is an oil pump in the fuel tank, with an outlet pressure of 0.5 MPa and a flow rate of 500 l/min. Now, it is necessary to supply oil to a test bench, requiring a pressure of 0.1 MPa and a flow rate of 100 l/min. How can this be achieved? Can a control valve be used to ensure the pressure and flow rate downstream of the valve? Question from a beginner: When a control valve is in use, the pump flow rate decreases while the pump pressure increases, and the pressure before the control valve also rises. Does this have any impact on the pump?
First, check whether your pump is a positive displacement pump or a centrifugal pump A centrifugal pump should work. With positive displacement pumps, it is difficult to adjust the flow rate using control valves. A primary circuit can be added to return to the fuel tank.
First, check whether your pump is a positive displacement pump or a centrifugal pump A centrifugal pump should work. With positive displacement pumps, it is difficult to adjust the flow rate using control valves. A primary circuit can be added to return to the fuel tank.
It’s best to add a self-return pipeline as well
“The requirement of 0.1 MPa oil pressure is intended to prevent the test bench from being damaged if the pressure is too high. Flow control can be used to ensure that the outflow rate from the test bench is greater than the inflow rate, thereby preventing damage; for example, the outlet pipe can be made larger than the inlet pipe, or a flow-limiting orifice plate or control valve can be installed on the inlet pipe. With a centrifugal pump of 500 ml capacity, achieving a flow rate of 100 may easily cause the pump to stall, so a return flow is required. To adjust the flow rate of a positive displacement pump, a return flow is required (for pneumatic pumps, this can be done by reducing the pressure of the air supply)
A centrifugal pump is to be used; where should the return flow be connected? On the pipeline before the pump outlet and the control valve?
Is the loop connected between the pump and the control valve? Is it necessary to add an oil overflow valve to the circuit?
Just add it here, install a valve to regulate the backflow based on the outlet pressure
Should a control valve or a regular stop valve be installed? Thank you!