When choosing a hydraulic power unit, like the ones from https://www.hydraproducts.co.uk/Hydraulic-Power-Units for a machine, you have to take into consideration not only its performance characteristics but also its installation in terms of the type of machine you have and the type of work it will do. Hydraulic power units come in two forms: direct pumping and indirect pumping. In choosing between these two types of units, the amount of hydraulic power per stroke will be an important factor, as will the performance characteristics of each type. For example, a high performance unit has low pressure output and high fluid pressure per stroke. This means that it can pump more water with less effort while a lower performing unit will have similar performance characteristics but lower pressure output and lower fluid pressure per stroke.
To decide your hydraulic power unit correctly, first it’s important to begin by determining what the recommended torque, or stroke, of the machine’s motor is in order to achieve your desired pressure: Nominal [TB1] torque: recommended in W (kgf / Ft-lbs) or a (Nm / Ft-inches), it’s the force per stroke of the motor which drives the pump. Next is the shaft frequency in him, which is denoted by F-number, and then the temperature of the hydraulic system, the T-number, denoted by T-chill..
A final consideration when selecting a hydraulic power unit is to take into account its installation and its working conditions. It must be well equipped to handle the pressures that it will be asked to handle and must be designed and built with sufficient durability. It is common for the pressure of a motor to drop suddenly especially when installing large pumps that exert large pressure. The pressure drop could damage the pump, causing it to break down leading to expensive repair bills.