In normal injection moulding machines the main motor operates at maximum rated speed and hence the hydraulic pump coupled to the motor deliver maximum flow of oil. This full flow of oil cannot be utilized in process and therefore it is controlled by hydraulic valve so that partial amount of oil is utilized during process and the remaining oil is reverted back and hence the power consumption unit hour will be in higher side.

In normal injection moulding machines the main motor operates at maximum rated speed and hence the hydraulic pump coupled to the motor deliver maximum flow of oil. This full flow of oil cannot be utilized in process and therefore it is controlled by hydraulic valve so that partial amount of oil is utilized during process and the remaining oil is reverted back and hence the power consumption unit hour will be in higher side.