The method of regulating the valve causes a large amount of electric energy loss in the damping caused by reducing the valve opening degree, so that the working condition moves to the left on the characteristic curve of the oil pump, which reduces the operating efficiency of the system and consumes more electric energy. Parallel operation of multiple oil pumps As mentioned above, in the oil supply system with large changes in oil quantity, multiple pumps of the same model or multiple pumps of different models are set to work in parallel to adjust the flow rate by adjusting the number of oil pumps, so as to meet the requirements of the pipe network for the change of oil flow rate. In this mode of operation, the number of units should not be too many, which not only brings management trouble and reduces operation efficiency because of too many units, but also increases the start and stop times of the oil pump and shortens the service life of the equipment. In this way, the flow rate change cannot be continuously adjusted, nor can it be used to adjust the time change
Reduce the opening of the valve this is often used in the production of flow regulation.
When the working head of the oil pump is higher than the oil pressure required by the pipeline, in order to meet the requirements of the pipeline, the opening degree of the oil outlet valve of the oil pump is reduced, so that the increased oil head loss of the valve is exactly equal to the difference between the head of the oil pump at a certain oil supply and the pressure required by the pipeline, and the characteristics of the pipeline are changed to meet the head of the oil pump at the corresponding oil supply.
