Hydraulic Pumps
Hydraulic Pumps The electric driving motor combined with the pumping is known as a hydraulic pump (in most pieces of literature, it is referred to as a motor-driven pump also). The hydraulic pump takes hydraulic fluid (mostly some oil) from the storage tank and delivers it to the rest of the hydraulic circuit. In general, the speed of the pump is constant and the pump delivers an equal volume of oil in each revolution. The amount and direction of fluid flow is controlled by some external mechanisms. In some cases, the hydraulic pump itself is operated by a servo-controlled motor but it makes the system complex. The hydraulic pumps are characterized by its flow rate capacity, power consumption, drive speed, the pressure delivered at the outlet and the efficiency of the pump. The pumps are not 100% efficient. The efficiency of a pump can be specified in two ways. One is the volumetric efficiency which is the ratio of the actual volume of fluid delivered to the maximum the